rear frame rail and torque box replacement

[johnt]

So I have a 69 mach 1, acquired as someone else ditched the project. Car was cut up, its in a bunch of pieces lol. Front end was all left in place, along with the rockers, everything else has been cut off the rear. I have purchased rear frame rails and torque boxes as a one piece unit, and am now trying to get placement of these pieces right. The only dimensions I have been able to find are for a 70 mach, can someone please verify if these are the same?