Is the correct pressuer relief gas cap still availbable for purchase anywhere?

[Dibbons]

The 71 and newer B bodies seem to have a special gas cap with a rubber gasket and a relief valve. Are these items available new? Thank you.

 

[72RoadrunnerGTX]

Filler neck changed in April ’72, both styles are available. Stant 10806 up to April ’72, Stant 10807 after. Fuel tank vapor separator changed at the same time, where is yours located? LR wheel well or forward of the fuel tank?
10806 left, 10807 right;

 

[440roadrunner]

I do know that the A bodies are a "mess". There are several caps because of the changes in the evap smog nonsense. Be careful and check it out

 

[Dibbons]

Production date May 1972, expansion tank forward of tank, cap appears to be the one pictured on the right. Thank you.