Leviton Lampholder For G24Q And Gx24Q Lamp Bases 4-Pin 26725-403 - The Home Depot
Satco Vertical Mount 4-pin Bottom Screw Down CFL Lamp Holder Socket - 75W, White 45923915512 | eBay
E-Simpo® 6pcs 2G7 4-Pin H Lamp Fluorescent Light Holder 2G7 Base Horiztonal Single Head Tombstone Lamp Socket for LED Fluorescent Tube(2G7) - - Amazon.com