Radiator cap help

Guys,
I just put a Griffin radiator in my 50 ragtop but the cap off the Walker I took out won't fit even though both are recovery type radiators. I'm looking for about a 7 lb cap that will fit the Griffin. I found a 14 lb from a mid-80s GM pick-up but I don't want that much pressure. Does Stant or someone else make one???

 

We got a 7 pound recovery type cap from Speedway for the Flower roadster, it's a standard neck cap so I'm not sure what the Griffin has but this cap will fit 90% of what's out there.

 

check your local napa...should have a 7 lb available