RC15 Radiator Cap GM AC 861050. Very nice original RC15 Radiator Cap. Big ear cap with solid rivet. Don't let it get away if you need a nice one. Check out my other caps.Doesn't come with AC box. The item "OFFERS Looks Like NOS RC15 BIG Ear Radiator Cap AC Show Car Mint" is in sale since Monday, August 19, 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.