The outer of the crv axle. I have read the you just need to swap the outer of the of the axles so they fit the hub. Im using a integra front hub to keep the 4 lug because the crv is a 5 lug. The integra hub is a 26 spindle and the crv rear hub is a 23 spindle. The only thing is that the outer side of the crv axle looks like the inner side of the axle so with that said i need to use civic/integra axle and swap the inner cv axle.