For 72-4, there were different ones.
8908029UC 6 cyl.
8904981CA 350/400 w/o HD battery
8904982CB 455 and 350/400 w/HD battery
Lectric Limited (
https://www.lectriclimited.com/shop/...-ground-straps )
and M&H wire harness (
https://www.wiringharness.com/ymm-se...carline_id=111 )
sell them.