hey man, welcome to the forum...
Those wires are for those lights just below the tail light Just unplug the turn signals you have and plug this in and you have the "euro" turn signals.(remove the bulky ones of course.
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The variator doresnt get derescricted.. The boss drive IN the var does... If there is a shoulder/flange on one end of the boss drive, grind that off round with the rest. be careful to keep the same shape.(you can buy them also)... Hope this helps.. Keep us posted.....