I assume you are looking for the original bulb socket. I ordered some from a place I think was called Antique Auto Supply and they shipped what turned out to be only the insides with the contacts. I&I reproductions I think have them listed. The other avenue is to buy new reflectors from Chevs of the 40s with the sockets in them. They also sell them set up for H4 halogens. The trick here with the Chevs of the 40s product is to make sure the product fits your truck. The reflectors were different for 37 , 38 and 39.
