yes i just replace my rockers on my 88 420sel due to low oil scored the cam so i had to replace all 8 on the right bank.
i believe mine were febi. frankly they are same inre quality. just make sure when you install them that there are no burrs and use an assembly grease on both the cam lobe and the rocker on both ends. spring side and lobe side.
1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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