Some parts are available from Nissanpartszone.com. Others are available on ebay. The marine
specific parts MAY be available from Keith at Blue Ridge Marine
in Everett Washington
. Be sure to be sitting down when you call Keith. The parts can be pricey.
I just completed the rebuild
of an SD22 in a Cabo Rico
38. Unfortunately, the marine intake/exhaust manifold is broken, and may not be repairable. A replacement is 2K. Now we are looking at re-powering with something newer. So that rebuilt SD22 is available to someone.... missing the manifold.