sigma front brakes are the same size as lancer ones. I didnt need gearbos x member either, but that may be cos i got custom engine mounts. Personally i wouldnt buy a sigma, id just buy a 40$ gearbox cos thats pretty much the only thing you need and mock up some mounts and get an engineer to weld them. sigma drum brake diff would be only slightly stronger than a ex one, theres plenty of peeps using ex ones that havent broken. arent you just gonna build it to sell anyway? why waste extra cash when it would have no gain to you?