Re: GV Tail Lights, How To Guide Reply #20 – December 12, 2015, 04:51:01 pm Quote from: mike leary – December 12, 2015, 04:42:32 pmMy RV buddy told me the same thing; some use the 1157 and others use the 3157; something about the bayonet fitting, go figure. I've taken out that turn signal module, not a lot of fun. Now I'm wondering whether I've got a 3157 or a 1157! Quote Selected