All I can help with is that my
1970 parts book shows 2 different numbers.
(B) Barracuda....2999 380-1
(J) Challenger....2999 383-3
However, does that mean that they are different
I did part out a '72 Challenger years ago and can't remember what happenened to those regulators, did I ues them because they were newer, or did they go with my big cleanout sale, another