Use pieces of exhaust pipe with a slice cut out and trim the length to fit the hole. It takes a little cutting and trying, but the sleeves don't seal vacuum. They only align the manifold so the gasket can do its job properly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!