(Edited: ......I think I just now found out what kind of bolts these are.... These are rubber stud bolts. My mechanic told me they're threaded on the underside, so you screw them into the frame of the car and the rubber with the bolt is on the topside. He said the flathead bolt is glued to the rubber. He said Superglue is enough to hold the bolt to the rubber).




I'm trying to put the monowiper back on my 1991 300d W124.

There are 2 rubber bolt posts on the left; an upper and lower one. You slide the slotted area of the monowiper over the bolt posts and put the nuts on the posts to tighten them down. The 2nd photo that I got from a YouTube video shows what it is supposed to look like with a hex shaped bolt with hex shaped rubber backing there.

Back to the 1st photo, my lower bolt is there and it has a gold color nut on. But the upper bolt is gone from the rubber. Maybe when I took the monowiper out, that bolt got hit and came off. I thought the bolts came up THROUGH the middle of the rubber but apparently not. Without the bolt being there, then I guess they're simply glued onto the rubber.

It seems weird that I would be tightening a monowiper down to a bolt that is held down only by some glue onto the rubber??? Can this be for real??

How or where can I get a replacement bolt, or adhere a bolt onto the existing hex black rubber that's still there under the monowiper? Not sure what type of glue they would have used to hold a bolt in place on rubber.

Thanks.

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Part looks like a rubber isolation buffer mount, a similar (or exact part) is also used for mounting the air box on various models.
The rubber is vulcanized to a top and a bottom stud, and acts to absorb vibrations.
IMHO, it would be best to replace the entire isolator.
Super glue (or other adhesive) probably won't hold as long as the original vulcanization.

Local MB parts department should be able to look up the exact part number.
Ebay link shows an aftermarket buffer similar in appearance to your second photo.
https://www.ebay.com/itm/276023398996?_trksid=p2332490.c101224.m-1

__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

I thought ACE sold stuff like this in those yellow bins. https://www.jwwinco.com/en-us/products/3.4-Installing-Lifting-Damping-with-Leveling-Feet-Lifting-Gear-and-Rubber-Elements/Vibration-shock-absorption-mounts-rubber-bumpers/GN-351.1-Vibration-Isolation-Mounts-Cylindrical-Type-with-Steel-Components?artikelnr=351.1-16-13-8-55&msclkid=f1f741e1bec0137856ff298f55b6294b&utm_source=bing&utm_medium=cpc&utm_campaign=PMax%7CNB%7CShopping%7CUS%7CAll&utm_term=4584551172938635&utm_content=Catch%20All

Go to mcmastercarr and spec it out.

Part number is 124-988-00-11 (https://classicparts.mbusa.com/oem-parts/mercedes-benz-mount-frame-insulator-124988001164). Grab a handful from a pick-n-pull.

Sixto
05 E320 wagon 219k miles
99 SL500 69k miles