NOS BIG Ear RC15 Radiator Cap. Beautiful original RC15 cap with original plating. The item "Original NOS BIG Ear RC15 Radiator Cap Shines AC Show Car Mint box" is in sale since Saturday, December 14, 2019. This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Cooling System". The seller is "widetires22" and is located in Oneonta, New York.This item can be shipped worldwide.