They have basically confirmed on their website that your turbo is the
5324-988-2702 / MB part # 003 096 3299
Which information is cross confirmed by the Ozzie website PROCHARGE

(MAYBE...We really don't POSITIVELY know YET which turbo MB put on.
BUT the Turbo suppliers say that's what on your chassis)

AND finagle out of them the gasket kit part number so you can order one.

You might have to call BW's location in Germany since I suspect it's the
Old KKK "Brick and Mortar" site.

Hang in there...It's out there somewhere.Too many of those engines
were sold worldwide for kits not to be available.
(No Matter what Kent Bergma claims)

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'84 300SD sold
124.128