GE Porcelain Lampholder with Outlet and Pull Chain, Medium Base, Grounded Plug, Indoor Lighting, 3-Prong, Mount on 3-1/4” or 4” Box, UL Listed, White, 18305, Light Sockets - Amazon Canada
Ceramic B22 Porcelain Lamp Holder, For Electrical Fitting
GE Porcelain Lampholder with Pull Chain, Medium Base, Indoor Lighting, Mount on 3-1/4” or 4” Box, 250VAC/660W, UL Listed, White, 18303, Light Sockets - Amazon Canada
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EATON Wiring 604-SP 660-Watt 250-volt Medium Base Ceiling Receptacle Lamp Holder, Porcelain, White, Light Sockets - Amazon Canada
TWDRTDD Porcelain Keyless Socket,E26 Medium Base Porcelain Lamp Holder Socket with Two Hole Flanged Mounting and 4" Leads : Amazon.ca: Tools & Home Improvement
Legrand-Pass & Seymour 9880CC10 Medium Base Lamp Holder Porcelain Surface Amount Type, Two Piece Construction, Light Sockets - Amazon Canada
Porcelain Lampholder Light Socket Medium Base 4KV Pulse Rated 600W 70046-100 | eBay