I have the redesigned (INDY) engine/gear mount, but none of the pilot holes in the fuselage matched the mount - not even close. I had to bolt the mount to the airframe with AN3 oil cooler bolts to allow enough play to align the mount, then I turned a 3/8" stainless bushing with a 3/16" hole in the centre. I bored out the bushing for successively larger drill bits and eventually relocated the worst of the pilot holes. The other holes were a breeze once I had a correctly located 3/8" bolt to align everything from.