4KV Pulse Rated E-26 Medium Base Keyless Porcelain Lamp Socket with 6/32 Threaded Mounting
Leviton 660W Medium Base T8 Bi-Pin Low Profile Slide-On Straight-In Double Edge Standard Fluorescent Lampholder, White 13451-20 - The Home Depot
Leviton 30 Incandescent Lampholder, Medium Base, Two Piece Porcelain; 660W- 600V; Keyless; with Two 8-32 By 1/2 Inch Long Mounting Screws. - Light Sockets - Amazon.com