I got the packet from Synchro and am suppose to replace it. I seem to have misplaced the top of the package though that I did save and don't know the part number. I'm going to be cleaning and moving stuff to storage int he next couple weeks though so I'm sure I'll find it then. ANyway, I will order another kit and then see if I can get some gasket material to cut to match.
BTW, I don't think my hubs have been submerged yet, unless they got dunked when Rick and I went to Oregon. Seems I replaced the gaskets after that trip though (as if i would remember!) and everything looked fine.