Suggestions for aftermarket buckets- light, supportive...period correct looking too?

Is there such a seat?

I'd love to keep the interior of my Dart all stock. The original vinyl on the bench is in decent shape (a few minor tears on the driver's seat, otherwise very clean)...but the seat is a major hinderence to enjoying the car on the back roads, even with stock suspension.

Can anyone offer suggestions on a reasonably period correct looking vinyl bucket that will hold the driver's butt in the seat?

What is the usual seatbelt solution?

I'm very interested in suspension/tire mods down the road...these would be pointless without more support.

Thanks for any suggestions.
-Mike