These wires are for 70 Charger only. They run the headlight motor to open the doors. You will not need them on a RR. New harness must be generic. I would tape up the connector and even possibly tape this entire pigtail to your harness under dash.

70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts