Satco 90-1550 Fluorescent Lamp Holder G24Q-2 or GX24Q-2 for 18W 4 Pin CFL Lamps | 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
LH0900 Vossloh 527795 18w, G24q-2, GX24q-2 4 pin CFL lamp holder with two hole horiz. mounting
G10Q 4-Pin Tube Light Socket,Ceramics 4-Pin G10Q Base Socket for FC8T9/DL Circline Fluorescent Lamps (Pack of 2) - Amazon.com
Hook 4 Pin CFL Polycarbonate Holder
Feit Electric 32W Equivalent PL CFLNI Triple Tube 4-Pin GX24Q-3 Base Compact Fluorescent CFL Light Bulb, Bright White 3500K (1-Bulb) BPPLT32E/35/HDRP - The Home Depot