as far as gasket material, I have bought this rubber /cork material..it comes rolled up its about 10 inchs by 18 inchs, I cut gaskets out of it and punch holes for the openings, I have even used it for exhaust gaskets and it does a fair job...

I bought it at a local auto parts store ARNOLDS, it was only about 7 bucks a piece, I use it for other things like rubber washers and such,