If you haven’t tried Stephens in Alabama, might be a good chance.
Tony’s parts, and if neither have them, can probably point in the right direction.
Good luck
70-74 E Body Cuda / Challenger Under Dash Heater / A/C Wiring Harness #2983247, Used $25 + Shipping. Payment: US Postal Money Order Only! Shipping US Address Only! Call: Steve 810-629-1097
No damn my bad luck he does have a set for a 70 and a 72 but the 71 was different. It has the retaining screw over the lip inside the gap between the door and the quarter panel and he only has one and I imagine he will find it today and if he doesn’t, then I’m still on the hunt for a pair and I have calls into those two places now I’m gonna have to call the one that was mentioned last that is in Alabama