Wheels, when I first brought mu '52 GMC sub home, I set the seats from my '99 Chrysler mini-van in it. I used an extra pair too so I had 4 buckets and a bench. They looked good and the seats are some of the best buckets around, I've put thousands of miles on my van and they are comfortable on the long haul. Since then, I have done some measuring and it looks like I can just cut the whole floor out of the van, remove the pw floor and weld it in. That way I have all of the quick release mounts, as well as comfortable seats. The only disadvantage is not having integral seat belts.
Also, for those of you contemplating anchoring your seatbelts in the floor, as someone mentioned earlier, be sure to have a good sized strap running across the undercarriage and anchored well. I used to build conversion vans back in the day and we used a heavy 6" dia. washer, but that was a steel floor too. We also cut up many a mini van (Chrysler) and lowered the floors in them, So I know just about where to cut so I don't blow myself up!