If the foam is any thicker than my stock '07 in that area, I might opt for trimming it away from the hols and bonding the cover to the base around the hole, like on a Husky. You can use a bolt/fender washer to hold it together while the glue dries and you fit the rest of the cover.
If you just go with a washer, I'd put a grommet in the seat cover like stock, then a rubber washer, then fender washer. Select a fender washer slightly smaller OD than the rubber washer to keep the metal edges off of the stretched cover. This stopped mine for inevitable tearing.
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