Trail gear says 11inches forward for the front leaf spring mount from stock location. They also want you to mark center of the old mount on the frame and cut everything out the way before proceeding. Since i do everything alone i knew trying to hold these mounts, measure, them, and square them then tack all without moving its position was gonna be a pain.
So i took two pieces 1.5" flat and tacked them together on the sides. Then measure my 11inch spread on center and drilled 9/16" holes.