My GEN1 has developed a miniscule leak at the thermostat housing. Very minor - an ounce or two every time I drive it. I've replaced the o-ring with the (astoundingly pricey) Ford factory o-ring, and that sealed it briefly. But it's started to leak again. My thought is to help the o-ring with its sealing duties by making a gasket to seal between the thermostat housing and the block. The surfaces are machined flat, the thermostat housing is cast aluminum, and it is bolted to the block with two bolts with 8mm hex heads. Is that a viable solution to the problem? If so, what should I make the gasket out of - paper, cork, something rubberized? If that's not a good solution, what is? Any solution advice and/or ideas will be most welcome. THANKS!