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Got mine from American Muscle, plug and go, $139 though so they are not the cheapest. Took like 10 minutes to install, look awesome! Can't say how the ebay ones are though, sorry!
Webelectric's plug and play harness. I think they raised the price because the newer ones came with the "no-brake" sequence option. I thought it was worth it, but still a bit pricey of a mod for what it accomplishes.
p.s. It's just a phone cord that extends between the two harnesses.
AM 139, plug and play, I hate when I see others with them... I no longer feel unique.. my favorite is these do a quick sequential when you step on the brake and when you lock the car.