All the seats mentioned in this thread are awesome, I needed to find something more affordable for my big block Duster so I bought sport seats off ebay for a total of $200 shipped for the pair, even came with slider brackets which I always bolt straight to the floor for head room.
I think for the money they are great, I'm 6'2 230# so I wish they were a little wider but they're fine and they hold you in place very well if you do any cornering.

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1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual