ok so im buying this complete swap tomorrow motor and tranny etc. so i know its a fairly easy swap but my thought was since i have a 4 speed trans and the z6 is hydro 5 speed. btw i am doing the cable to hydro conversion. but what axles do i use? or do i swap over front hubs from an 88-91 si or what... this is my only confusion. cuz the std axles are 15 splined right..and the sis are 21 which the z6 are the same if not mistaken.. lmk thx