Aftermarket fuel tank problem

[TexasLS1]

Gonna bring back this old thread---
Just put a new Spectre fuel tank in my 72. My old tank/system had EEC and so does the new tank. I went to swap the fuel cap from old tank to new tank, and the new filler neck is larger, so my cap does me no good. Anyone have ideas? Did Spectre weld the wrong filler neck on? Any ideas on finding the correct cap besides trial and error? Kinda wishing I had just resealed my old tank, wasn't even rusty like I thought

Does anyone know for sure if there is a larger, non-vented cap than the 72 w/EEC cap??