I'm not a fan of the Teas Designs or Glide Engineering seats. Just strike me as more frail and wimpy than an OEM seat out of something.
I had a customer with a 1940 Chevy and he had a pair of buckets out of a newer Monte Carlo (somewhere around 2000 or so). I pulled the headrests and redid the covers to make them more low-back.
A LOT of street rods (trucks too) have done quite nicely with Pontiac Fiero buckets. I was just measuring a set I have that I'm going to redo and install in a customer's 32 Ford roadster. He also has a Ford Ranger pickup that he's wanting to swap out the stock seats for something else. Those seats have a very very narrow footprint for the tracks, which would probably help you in fitting them in an older vehicle.
I have a set of seats from a Chevy Astro van that are very very nice as far as fit. They are very bolstered and sit deep and comfortable. They sit up on the pedestal piece for being in a van, but that also means you could use just the seat part, and adapt about any track set that you want, depending on how your floorpan is shaped.
I agree with the others. Just wander through the junkyard with tape measure in hand. Look for what seems to be a nice, full bucket and see how they sit. I like the buckets that are in Chevy Corsica (they don't flip forward) and Chevy Berreta (they flip forward because they were in a two-door) autos. They are a basic seat, with nice bolstering, that gives you a nice canvas to make whatever you want. And they're cheap.
I don't know what everyone else pays, but I get seats from my local wrecking yard for $25 apiece. I know the owner so I can even get full electric setups for the same, including the door switches and wiring harnesses. He usually lets me take the back bench pieces for free.