GPG38AS is what I have in my 1964 convertible Le Mans with factory air conditioning. I’m using a 1966 style radiator with the drivers side upper inlet hose.
This is the Cold Case Super Duty aluminum radiator with twin 1-1/4” tubes, their other radiators have twin 1” tubes.
Best to call and speak with one of their sales people and be sure you get the proper one, the part number I listed above is for an automatic transmission car. Be sure to ask about the Super Duty radiator with the 1-1/4” tubes.
https://www.coldcaseradiators.com/pr...8aAtjaEALw_wcB