1968 Plymouth GTX

[68gtxman]

Thanks, I will take a look to see if I have it.

Okay, I checked my pictures of the car's wiring before I removed anything and it wasn't there when I got the car. Guess I will need to find one.
View attachment 1793616

Looking at the yellow crimped on connector on the red wire, it is clear that someone did some work on that relay, likely before you got it. MOPAR 1966-74 STARTER RELAY SHIELD | eBay. https://www.classicindustries.com/shop/search/?q=Starter relay shield

 

[retractable]

The F part is way cheaper if you look it up under a ford part and it is the same

 

['68 Coronet R/T]

Looking at the yellow crimped on connector on the red wire, it is clear that someone did some work on that relay, likely before you got it. MOPAR 1966-74 STARTER RELAY SHIELD | eBay. https://www.classicindustries.com/shop/search/?q=Starter relay shield

Oh yeah. They didn't care a bit about originality and their modifications were a mess as well.
Put disc brakes on the car but did it backwards, thus removing the sway bar and cutting off the sway bar brackets. And many other things as well.