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
Gx24 4-Pin Base LED Bulb, 12W G24q PL-C Horizontal Recessed Light 26W CFL Lamp Equivalent for Kitchen Light Pendant Lamp Dining Room, Warm White 3000K, 4-Pack (Remove/Bypass The Ballast) - Walmart.com
E-Simpo 6pcs 2G11 4-Pin H Lamp Fluorescent Light Holder 2G11 Horizontal Screw-Down Light Socket Base PL CFL LED Light Socket Lamp Holder 500V 2A (2G11 - - Amazon.com
LH0910 Converts a 4 pin CFL lamp holder/socket to an E26/E27 medium base lamp holder/socket
Feit Electric 18-Watt Equivalent PL CFLNI Quad Tube 4-Pin G24Q-2 Base Compact Fluorescent CFL Light Bulb, Soft White 2700K (1-Bulb) BPPLD18E/HDRP - The Home Depot
Feit Electric 13W/18W/26W Equivalent PL Horizontal 4-Pin Universal Base G24Q/GX24Q-1/-2/-3 CCT Select(2700K/3500K/4100K)LED Light Bulb PL26A/H/CCT/LED/HDRP - The Home Depot