What is the right washer to use with aluminum bulkhead fittings (such as
AN832-8D)? There are a couple of places where the nut bottoms out
because the rib or bulkhead is too thin. The catalogs don't have
aluminum washers in that size, and I assume steel is a no-no (due to
galvanic action).

Thanks,
Adam Molny
Legacy #151
30% complete