Do you need seat covers as well?
Several custom upholstery shops have them, but I don't know if you can buy them without the seat cover. May have to write or contact them, if all you need is the arm rests. They make stuff as ordered, but may need a special order that isn't setup in the online store. In my previous van I had NW Unlimited covers, which are similar to Wet Okole. They had the option for arm rests as an extra with the seat covers. The neoprene covers and arm rests worked fine. Kept my tan upholstered seats and arm rests mint throughout the years. I took the covers off, when I sold my van and it was like the tan seats were brand new.