Leviton 49875 B01-09875-000 1-Piece Keyless Top Wired lamp Holder, 660 W, Incandescent/Fluorescent/CFL, Medium, Pack of 1, White - Light Sockets - Amazon.com
Leviton 3152-8 - 1-Piece Bracket Mount Porcelain Keyless Medium Base Lampholder
Leviton 9885 - 1-Piece Front Mount Porcelain Keyless Medium Base Lampholder
Leviton 9880 Medium Base, Two-Piece, Keyless, Incandescent, Unglazed Porcelain Lampholder, Surface Mount Low, Single Circuit, Back Wired, White Pack of 1 - Medium Light Socket - Amazon.com
Leviton Keyless Medium Base White Porcelain Lamp Socket - Carpenter Bros. Hardware & Rental