Hi - I have listed on e-bay right now a Socket for Pre-focused headlight bulbs N.I.B. (new in the box) manufactured by Standard Products; their # S-33. It looks GM to me, but you would have to take a look. Also printed on the carton is: E8U which I do not know the meaning of. $2.95 +shipping. look on e-bay under : e-bay motors>Vintage Car & Truck Parts>lighting & lamps. ( my e-bay I.D. is: 1124roy )