I have a Yakima rack for my W123. I think you're OK with 48" bars, let me check.

I do believe the rubber feet are supposed to hook underneath the chrome raingutter, so you should be good there. Besides, door won't shut otherwise. Don't overthink this.

You can call Yakima and they will help you; also, if you're missing any rubber or plastic miscellaneous bits they will send you some free of charge. Great racks, and when I talked with them about a Yakima bike trough I bought off eBay about five or six years ago they sent me the hardware needed to mount it up to my rack free no problem.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)