P/N needed for tensioner pivot bearing cover

[scottmcphee]

For OM603.960 engine in 1987 300D. It's a flat plastic cap that snaps onto the tensioner, over the bolt that holds the belt tensioner to the engine. I need the MBenz part number for it, and to know if there is an aftermarket source or MBenz only.

One didn't come with my replacement tensioner, and the old one was so brittle it shattered upon removal. I'd like to cover that bearing before winter sets in and all kinds of road salt and crap will get it it through the grill.

Thanks!