That fixture should be snapped into the panel like the tag light fixtures in step bumpers. Infact those little round tag light fixtures are nearly identical
They are tight, though, if you haven't pulled them before. I thought I was going to break something. But once they have been out once, they're a cinch.
yes. Like to see your blue convertible close up. I want to post some pics of my banana yellow (viper yellow actually) '68 barracuda conv. but am hamstrung by weather right now. I am impressed with volume of expertise on this site ...decent guys... and gals no doubt!