I used the 3mm(1/4 inch) led's that you can get at Radio Shack. They have a positive and ground wire coming off of them, pretty easy to do. They are the exact same ones as these- http://www.detroitspeed.com/productp.../leds_prod.htm
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts