A brand new aftermarket generator/alternator tensioner rubber shim  to suit the M121 & M127 engines. 
 
Rubber grommets on the alternator/generator adjusting rod disintegrated or falling apart?
 
Perhaps they are missing altogether.
 
OD is 27mm, ID is 13mm, Thickness 6mm/
 
We have a high quality aftermarket replacement part to suit.
 
 
This part will suit the following MB vehicles & engines:-
R121 190SL       (1955 to 1963)
W113 SL            (1963 to 1971)
M121 Inl 4          (1953 to 1967)
M127 Inl 6          (1958 to 1967)         
 
 
This part is shown as no 61 in the parts diagram attached.
 
Part Nos:- 
A1211550481
1211550481
A121 155 04 81
121 155 04 81
121 155 0481
121-155-04-81
 
Don’t pay $65.00 each at the dealer, our price is $17.75 each.
NB:- Two grommets required per vehicle. This item is advertised on other sites and may be sold without notice.
 
Please check you have the correct part number for your vehicle.
 
Most parts for W105, W110, W111, W112, W113, W114, W120, W121, 190SL & W180 Mercedes available.
 
McStarparts – “We keep classic Benz’s on the road.”