I purchase 2 bulbs about 4 months ago for my low beam and they work perfect so I figured I would order the high beam

I purchase this item and hope so using it for my high beams. I purchase 2 bulbs about 4 months ago for my low beam and they work perfect so I figured I would order the high beam. I installed the high beams yesterday but they do not work. Can anyone let me know why?

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