Basically there are 2 different ones from the aftermarket. One is like the ones used on large trucks. The other one is smaller & has an old patina look to it. Although the big one is better I like the small one as it looks better on the old truck. It is cheaper also. Not many of the specialty suppliers have the small one anymore but Speedway Motors still does. They come with directions & scematic. If you want your rear turn signals to go with the stop lights you will need a 6 or 7 wire switch. If you get a 4 wire switch you need separate lights in the rear for stop & turn lights. Sometimes you can find one on an old car/truck in the salvage yard but the wiring is hard to figure out as they all use different color sceams. Some of the old ones had a little rubber wheel that rolls on the hub & cancels the switch after the turn.
George
