One quick question abotu my new stem seals. the old ones were rubber bottom and top and they popped on the valve guides. The new ones appear to have a brass base that is driven over the guides with a normal rubber seal around the valve stem.

is this the new replacment valve stem seal?

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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