Have you tried a search at the bottom of this forum. Try prechamber tool or soemthing like that and you may hit a winner. My understanding is that the spec is out there on the size of the prechamber and threads so you may be able to call them with this info and get what you need.

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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