EXPERTS HELP! I'm looking at acquiring some parts, and this ODD BALL convertible header bow is up for grabs. I have some early 50s gm convertibles so naturally this spartks my interest. We just don't know what it could be off of. There is a telling , half moon concave factory indentation on the very front center. I KNOW someone out here knows just the year/make this could have came on. Would have a very unique object such as antenna or emblem on the top CENTER of the windshield frame that this must have accommodated. Thoughts?