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The number for the socket is Pig Tail Plug 7440 T20. Just google Pig Tail Plug 7440 T20 and you can find several suppliers. I got mind from partstime.com but there are others. The bulbs are GE 7443...

I decided to eliminate the led issue by replacing the brake light socket and bulb with a combination taillight brake light. You need to get 7443 Bulb Socket Brake Turn Signal Light Harness Wire LED...