We're getting there Gunner! Here's a summary of my suggestions. #2 is similar to the emblem on the ERA pedals. The snake head with the flag may be a bit too "Contemporary"
for an ERA application, but the plain one is not too far different from the old Cobra badges. #1 is my personal favorite, but that's just me.
EDIT: I agree about the dots. Particularly on the fender badges, the uninitiated may refer to the car as an "era" as opposed to E.R.A. When I get back, I will see what they look like with no dot after the "A". Time to go for a swim!