A simple Bosche style is the easiest to find.
http://www.ebay.com/itm/Car-Truck-Auto-A...c54&vxp=mtr
One similar to this. Found in just about any auto parts store with a socket as well.
Craig

2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado