The only seat component missing in the whole bus prior to today was the seat bottom of the passenger side front seat. Since the bus has the “walk through” option instead of the standard front bench seat, the seat bottom is hard to find. So tonight I built a seat bottom out of foam until an original seat bottom can be found. I used carpet padding since it’s fairly cheap and locally available; the technical foam industry name for this stuff is “rebond” since it’s made from foam scraps glued together. Rebond is also used in modern car seats, so although a seat made from carpet padding sounds weird, it’s actually correct/ideal. I glued the layers together with contact cement and then shaped the whole stack with an electric carving knife. The result is very comfortable and compresses much less than I was afraid it might.