I bought a set of XT's from a friend and it is the 6" set, but i plan on putting them on my DH bike, and i have rotors, and a rear adapter for the 8''. my only problem was i needed a front adapter and i got to thinking, am i going to need a boxxer-specific adapter for the front?? and if so how much do shimano adapters run for, i got the other one for free from another person.