RJS - Thank you!

I searched the internet first before asking and I couldn't find these! Much appreciated.

What is "Z"? (see below)


Wile E. Coyote
Super Genius, Lover of FCA US LLC Products
*************
68 Road Runner (440 4-spd), 71 Superbee (383 slap), 71 Charger 500 (383 4-spd wA/C 1of 182), 72 Imperial, 74 Charger SE (440 sunroof), 84 D350 Crew-cab Dually (440), 75 D300 Dually Tandem (318 4-speed)