74 dart 318 questions

The car sat in my garage for about a week. I was starting it everyday and once in awhile I would smell some fumes. I haven't smelled any for the past week as I've been driving it to work everyday. It runs fine, it has a little oil leak, which looks to be coming from the passenger side valve cover and it over heats randomly, but thats about it.:dontknow:

On another note, I just bought new marker lenses for the quarters and fenders. I have those fasteners you screw onto the plastic stubs on the backs of the lenses. I'm missing two, anyone know what those would be called? The studs don't have any threads, these kinda make a grove into them once you snug them down.