i few years ago i wrote and asked if any had switch over to 5 lug on a 65 or 66 with 67 parts and no one had. but now i have done it it took me a few years, and a new paint job to get it done. about 3 years ago i was backing my 66 mustang converitble out of the shed after i washed it and i got out to close the door and it popped into reverse and took off and ended up backing into another shed which did about 3 grand of damage. so from there instead of just getting it fixed i got the whole deal with a new paint job. it took them 2 1/2 years to do it but it looked good. after i got it back i set out to switch to 5. i took an old junk 67 mustang we had and took from the steering box to the control arms off. and the spindles. it was a pain to pull out the box and replace it but it all worked out fine in the end. every thing bolted up fine. and since then i have replaced the coil springs with some new v8 springs. one problem that i am about out of adjustment threads on the control arms.