The battery acid ate through the clip that holds on the headlight access panel. Fortunately, I saved many spare parts from a green 300SD I scrapped. I think I can use the old one as a tool to remove vent window knobs from W110/W111/W115 cars.
The battery case is difficult to install, which is why very few still exist. The battery must first be set on the tray. Then, the battery must be slid forward and back to allow the case to drop over it. There is very little room for this. Once the case is dropped down, the battery can be tilted toward the fender so it drops into the lip in the battery tray. Then the case can be snapped down into place and the clamp on the side tightened. That battery sure is strapped in well and is definitely not going to budge!
I found this case in a car at a wrecking yard. It was missing half of the seal that fits on top, but it's the same stuff they use on the firewall of W126 sedans, so I cut some of it to length.
Like I mentioned, the battery case is a tight fit. There is an indentation in the air cleaner for the positive battery cable to clear.
The nuts for the clamp are way down there.
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DON'T MESS WITH MY MERCEDES!
1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles