Billet Bonnet Shim Kit - Natural Finish RINGHOLDEN-SHIMBillet Bonnet Shim Kit Natural FinishSuit HQ WB Holden, LH UC Torana RINGHOLDEN SHIM NGHOLDEN SHIM Jim and Mike Ring, co founders of Ringbrothers, were born with a passion for creating cars more exciting than anything else on the road. The pair began tinkering before they were old enough to drive, barreling down the old country roads of Wisconsin with whatever pile of parts they could scrounge together.