I put a pair of pro car buckets in my 68 coupe. Very comfortable, and look good with the verticle pleats. They match very close to the pleats in my original back seat, but I am going to recover the back with the same material as the fronts.
They bolted right in with the tracks and adapters supplied but I find that the seat sits too high and there is not alot of head room left,(and I'm only 5' 8") so I think I will need to mount them to my original tracks.