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BA9s Bayonet Lamp Holder Bulb Socket, 1-1/8" Bracket for Bally Gottlieb (Qty: 5) - - Amazon.com
Variously Type of Ba9s and T10 Wedge Base Lamp Holders, Assortment of Lamp Socket for #555 and #44/47 Bulbs, Widely Range of Bulbs Socket of Ba9s T4w Lamps - China LED 555
10x BA9s Lamp Socket to E12 LED Light Screw Bulb Lamp Holders Adapter Converter | eBay