I am almost positive that bulb bases have a standard attached to them. Have you googled for an 1156 socket base?Not sure if this link will paste correctly, but http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2Fhobby.htm%23socksIf not google it. I am sure you can buy these locally. Compare images to what yours looks like.
---2012 2500HD LML