Guess these seats...really...please help me.

Thanks to you guys letting me know these are correct A-body seats, I decided to purchase them.
I bought them from a seller on eBay for $100.00 + $100.00 shipping to my door. I thought this was a pretty good deal considering they have the seat tracks and everything. Obviously the seats need new covers and the tracks need to be completely restored, but heh, beggers can't be choosers.

I have one more question...

Are the seat tracks different from 1973-76 like most everything else?