I am having having a heck of a time finding a pr of flat 3.5" flange header caps. You know the flat w three holes type that caps the header flange opening? I want to cap them. Then holesaw a 2.5" tap in the back side of the flange for exaust . Then I can mount some tuner extensions and look open ala 1960's. Need not be chrome, but it would be nice. Anyone know who makes them?