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if you're talking about the lower two bolts which hold the up pipe to the RH collector, anything will do. stainless is best because of the heat and corrosivity, and any fastener should be a grade 8 for strength, but as long as you get a matching bolt and nut you're good to go.
as far as idle vibrations if the gaps are very large you are very likely misfiring which will cause a shudder that may be felt through the chassis.
hth
ken
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