..can you find them at some manufacturer or lost in some warehouse somewhere? I'd call around and ask what can be done. I'll bet you'd find, as I have in the past, some sympathetic ear someplace that might work to your advantage. It's kinda like fishing, you gotta cast a lot of times to see where the fish are...

Uh, you could always go watertight bulkhead route, kill two birds with one stone.....