Got your PM and responded.

The "new" seals are the standard now as the seals for uprated engines is all they sell I guess.

The ones I got seemed to mount hust fine albeit a semipermanent fit but I think that is the point of these asnd the "gas seals".

Thanks

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique