G70 x 15 Firestone 500 Radials
 

What year Trans-Am used these i know 1973 had them

1973 through around 75 but they were recalled so other model radials were replacing them.

The 73's had their own distinctive white Firestone shield logo on the sidewalls alongside the white letters. The 74 and newer 500's had the same shield but it was blackwall with only the letters being white.

I have some white stripe from a 1973 Corvette