im putting vac pump back on my 79300sd-gasket is hard to get,seems to be only available with rebuild kit at 275 $,gasket has to have 8 holes-6 for bolts and 2 for guide pins-different than later pumps,im wondering what happens without gasket,useing some sort of permatex or useing gasket material and making one-though this is hard to get right,any advice

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95 e320,87 sdl,79 300sd