if the bolt is a standard metric bolt then a number will be stamped on the head. like, 8.8, 9.9, 10.1 those numbers indicate the bolts condition of heat treat. Be sure to get a bolt with the same number.
A source of the (puck) would be the urethane body mount bushings that come in body mount kits for things like pick-up trucks. Unfortunately the kits are a little pricey and come with a fairly large assortment of bushings.
I'll keep my eyes peeled during my travels and see what else I can find.
