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These appear to be the same part numbers (44478900100 and 4447890000) as the OEM 2016 fenders. Does anyone know if there's a difference between the 2015 WDF447 and the current W447?
 

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I put the fronts on with no issues. I used to be a mechanic for 8 years. I cannot for the life of me figure out how to install the rears.
 

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2016 Cargo converted into a camper van
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I ordered a set of mud flaps for my 2016 cargo van from E Bay for $46, the same site that several others in this thread have used.

https://www.ebay.com/itm/OEM-Splash...m=273102051675&_trksid=p2047675.c100011.m1850

The good aspects:
Very good fit- they match the contour of the van well.
The plastic appears to be a good quality.
The front flaps are easy to install with the included hardware.
The price is certainly right.

The bad aspects:
No instructions, diagram or parts list..... but not too surprising at this price.
The hardware for the rear flaps is a quandary. I used my own hardware to install them, which made the task as easy as the front flaps. (Buying 4 metal fender U clips from an auto parts store will allow you to use the screws that come with the flaps.)

Pic 1 shows the flaps, with a rear flap on the left and a front flap on the right.

I used a puddy knife and needle nose pliers to remove the 3 plastic fender clips in the front wheel well. The fender clips come out easily and you won't need them again so no worry if you damage them. Pull back the plastic fender well lining a bit to put the metal fender clips on the metal tabs that you just removed the plastic clips from. The silver metal fender U clips are a bit loose so I squeezed them a bit so that they stayed on better. If you drop one and it gets stuck in the trim, just remove the 10 mm nut on the underside to loosen the trim. The fender U clip should fall out. Realign the wheel well liner, put the mud flap in place and then screw it in place. It might take 10 to 15 minutes per mud flap. Pics 2 through 6 show the front flap.

On the rear flaps remove the plastic fender clip that corresponds with the top of the mud flap. At this point you'll be wondering why you didn't get more of the silver metal fender U clips. I had a couple of fender nuts handy so I used them along with the correct size machine screw. You could also use a metal fender U clip from an auto parts store and a screw that comes with the flaps. I spent a good 20 to 30 minutes trying to figure out how the 3 enclosed brown metal clips went onto the mud flap. There are 3 slots clearly designed for them. When I had a couple in place they were quite loose and would undoubtedly fall out so I removed them. Perhaps some of you recall the Gary Larson Far Side cartoon showing the dog scientists struggling to figure out the Door Knob Principle. If any one figures out the Fender Clip Principle, let me know.

The lower attachment point on the rear flap does not line up with a factory attachment point. There's one plastic fender clip that is close, but if you try to use it the mud flap will be distorted. I held the mud flap tightly against the van and drilled a hole into the plastic trim. I secured the mud flap to the trim with a stainless steel machine screw (#8 x 1"), washers and a nylock nut. You could also use a metal fender clip and a screw that comes with the flaps. With the flap sitting tightly against the van and attached securely at the top and bottom, I was not worried about not using the 3 metal clips on the rear flaps. Pics 8 and 9.

With the additional hardware handy, the rear flaps are even faster to install than the front ones.

All in all, I'm happy with them. They fit and look good. Installation is easy if you buy 4 additional U clips. Plus the price is tough to beat, although it took several weeks for them to arrive from China.
 

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The fourth Small clip goes underneath the bumper next to the torx screw recess that holds bumper cover and wheel liner to the body
 

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I made the plunge on the OEM Mercedes-Benz branded mud flaps before I read about the rear installation challenge. Interestingly, the ebay vendor included what look to be copies of pages from the MB service manual, one 2-pager for "Retrofit front mud guards" and another for "Retrofit rear mud guards."

I'm not too intimidated by the rear install, but reading the MB instructions reminded me of the old instructions on toys we got as kids from "Formosa." Some of the instructions rival Encyclopedia Britannica for their thorough coverage: ""Ensure the mud flap (1) is correctly fitted on rear bumper (arrows)." Others allow for suspense and drama in the job: "If assembly problems should arise during the mounting of the retaining clips, (2, 3), the fender liner must be trimmed back. For this purpose, slightly pull out fender liner in contact area of mud flap (a) and trim back at outside with a suitable tool in area of retaining clips (2, 3)." And finally, "Model 447.603/605/703/705/813/815 as of 01.04.17 Use retaining clips (2). Retaining clips (2) must be secured with higher force expenditure for design reasons."

So, this means do the front's first to build some confidence ten attack the rears, armed with X-Acto knife kit to trim away.

I am going to bathe everything metal in the MB "Cavity Sealant, Solvent-free" which sure looks like milspec Cosmoline to me., and possibly a squirt of silicone caulk into the screw holes.

Any tips?

Thanks -- BTW, I could scan those instructions if anyone wants them. They do have useful photos.
 

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I have all 4 and the fronts were easy but the rear clips are VERY tight. No trimming was needed. My advice to you is be patient and while doing the rear just remember once they are on, you are set for as long as you own the vehicle.
 

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I have all 4 and the fronts were easy but the rear clips are VERY tight. No trimming was needed. My advice to you is be patient and while doing the rear just remember once they are on, you are set for as long as you own the vehicle.

Desiderata?
 

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OK, here's the finished mud flap installation.

I followed the instructions of an earlier poster and the MB manual pages sent by the vendor and cut out notches in the bumper cover to accommodate the plastic tabs and metal spring clips. Good plan.

The passenger side came out great. I did add a stainless machine screw on the bottom of each to pin the lowest tab to the bumper cover. Also, took my first chance to whip out my official Mercedes-Benz "Cavity Sealant" (read Cosmoline like the kind they put on WWII stuff like firearms), even the same brown color, and coat the metal tabs and my added screw. Everything else is plastic.

I may remount the driver's side as it has a very small gap between the flap and the bumper cover that may or may not drive me nuts. I think it's about 3mm too low. Time will tell whether I can handle it.
 

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Here's a super close up of the gap.
 

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