Can anyone validate that a 603.961 takes 12 of 103 050 0058? I got 12 of these seals from Fastlane but I'm concerned because the intake and exhaust valve stems are not the same diameter though the valve guides have about the same outer diameter.

Perhaps 103 050 0058 is the part number of the bagged set rather than the individual seals? They all look the same.

Thanks,
Sixto
91 300SE
87 300SDL