I found some 1998 Toyota Sienna leather electric seats at a boneyard. They work and fit with room to spare in my 49 Chevy 3100. Mas gas is already out, so there is room for the seats. Any buckets around 22" to 24" wide and not more than about 26" deep should work fine. You have about 52" width max in my 49 to play with and that leaves room for a small console between the seats.

Good luck,
Mike