Measure the size of the grommets and do an Ebay search- - - - -they're available by the thousands, either as individual sizes or boxed kits with assorted sizes. Always run a dedicated ground wire from the regulator base to the generator housing. DO NOT rely on brass inserts or body sheet metal for a ground. I've fixed dozens of charging system problems by simply providing the generator and regulator with a reliable ground reference.
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!