WTB Reserve system radiator cap (early 70's)

[Builderguy]

Looking for the radiator cap on the left. Was used in the early 70's on several different models and years. Was part number 3673891 Thanks in advance.

 

[oldkimmer]

So these could be both colours? Kim

 

[Builderguy]

Yes, but my book for 73 B body shows it as the one on the left. The one on the right (in green) I think was for "A" bodies but I didn't research that.
This is the one in the B body book:

 

[oldkimmer]

Thanks for the clarification. I have the green 1. Kim

 

[Charlie Hughes]

The green one is the right one. It’s supposed to have the part number on it. The black one is for a 71 car