NAPA part number LS6388.

Conduct-Tite 85602 socket, for GM products, you throw away the metal bits and just use the plastic insert. Fits perfectly in a Studebaker light where the steel socket piece is still there but the plastic, contacts, springs etc. are long gone. 
N8N (Mar 2008)  SDC FORUM 
http://www.studebakerdriversclub.com/sdc_forum/topic.asp?TOPIC_ID=17072