Door Interior Pictures. Last picture is my temporary assist spring repair. I say temporary but all four of my doors on my 2 560SL's have these. One car has them for 2 years the red car has them for the last year. They seem to be holding up better than the factory original stked in pot metal.
ttnguyen23, the pictures that rancallo provided are very similar to what the 73 looks like, although they are of a 560. It would appear that there would be no room there for speakers.