There are many OM352's. Mine for instance is the Ultra powerful 353.902, 84ps, I suspect yours is slightly higher? The Engine number would be helpful regardless (we could try your VIN and see what it brings up if you want to PM me)
Do you mean hand pump gasket?
Which gasket?
Item 29?
or one of these?
Do you mean hand pump gasket?
Which gasket?
Item 29?

or one of these?
