If you look at the pictures and read the comments, these are PLASTIC wheel well liners. When at the SEMA Show and talking to the Penda representative, they were not aware of any other liners being used on the Ford Transit. The rep said there may be another vendor supplying different liners to Ford, just not them.
If you could send me your 17 digit VIN by PM, I can have my parts guy look at the build sheet and try to come up with the part number(s) or vendor who might have supplied the liners on your Transit if they were ordered and on the Ford window sticker. If they were add-ons at the dealership, then you would have to find out the source from them.