...man that is a heavy lift, finding a factory 8 track. I bet 90% of the few they made ended up in the trash to be replaced by a AMFM/cassette player, A few got stuck on shelves of garages and tossed by irate spouses saying "Honey, isn't this the tape player for that car you sold 10 years ago, I am gonna' toss it out since we don't need it!" LONG before anyone dreamed up E-bay insanity!
But...Keep plugging away at leads and you will find one of the few I bet.
1969 Firebird 350 Coupe, Rust free Texas body, formerly brown, now a TA clone with quality spoiler, latching hood and TA wheel; 1969 GTO Convertible Expresso Brown/Parchment(currently painted red). Both numbers matching. My first love was a Cameo White 67 326 Coupe, bought back in 1983, at the age of 17, for $1,200. Been hooked since on PONTIAC! Working on a 67 400 ragtop for customization-Gulf Turquoise/Parchment/400/4 spd! My winter project!