OK. Finally got the driver's seat in, after fabricating a beefy pair of brackets from 2x2 1/8" angle. The front is as low as it can go (due to the original bench seat mounting location on the floor pan) and they still sit a bit high. But I've never liked the low-rider look anyway, and getting them lower would require cutting and rewelding part of the floor pan. Will repeat the process on the passenger side.

Now, what do I do for seat belts? work

The Intrepid seat has the female end of the buckle attached to its frame and I didn't get the belts with it (although I could). I would prefer the belts to be fastened to the body, not the seat, so that my homemade brackets aren't part of the structure under load in the event of an accident.

I think I've got all the original Dart belts in the pile of boxes/bags, although 44-year-old webbing may not the safest choice!

So - do I:

Adapt the Intrepid belts to the Dart body?
Use the original Dart belts?
Buy new reproduction Dart belts?
Some other kind of restraint system? shruggy

Suggestions please?
thanks
Charles