The 71 fender can be turned into a 70 easily, just weld on a 70 headlight bucket mount. The 71 fender had a deeper recessed area due to the mounting of the 71 dual headlight bucket brackets. It sets the headlights back a little more than the 70 so the recessed area is deeper to allow room for the back of the headlight and wiring. The 70 can be modified to a 71 by making the front recessed area deeper like the 71. I robbed a couple pics from ebay for reference.
