I have a 3-Seat bench from my 2015 350XLT 15-passenger van. It is from the 2nd row. Light grey cloth. Bought the van used in 2017, immediately pulled it out and placed into storage. Asking $300 obo. Pick up in Carlsbad, CA.
You might need the 3 floor mounting brackets that would help sell it to someone mounting it in a cargo van. It doesn't even need to be a Ford Transit van. I sold a Charcoal Cloth 36" 2 passenger seat today that is going in a Dodge ProMaster with the 2 floor mounting brackets they can install in the metal floor.
Your other choice is to sell it via Craigslist and you may sell yours to someone with a Chevy Express van. Their Pewter Cloth seats are nearly the same color...just a different design.