The article also matches Handlebar turn signal set SIP 12V
Bulb H21W 12V/21W, socket: BAY9s
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2-Pack 64136LL H21W Halogen Long Life Bulb, 21 Watt, BAY9s Base, Vosla 38192 LLT, MADE IN GERMANY
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H21w Bulb
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Narva H21W Bayonet BAY9s Halogen Globe 24V 21W - 68196 - Narva
1. Category: Bayonet type fitment Incandescent-miniature lamp. 2. Base: BAY9S; Model: H21W; Voltage: 12V; Power: 21W; Glass Color: Amber; Material
ZMShun 2Pcs BAY9S H21W 12V 21W Amber Bay9s Car Fog Light Bayonet Bulb Car Halogen Indicator Brake Reverse Light Bulb BAY9S 12V 21W Car BAY9S Bulb H21W