I have the second Rod & Custom rear suspension kit sold on my 1968 Coupe and it fit great. We can get the car real low if we want. The kit has been redesigned and it is a little harder to install and you cannot get it as low as my car.
The upper shock mount now has heim joints because I'm sure not all early Mustangs have the same distance between the frame rails. Tack welded in place
Upper control arm crossmember and rear end brackets tack welded in place
Installing the rear coilover shocks
Everything was installed according to the directions and this is the lowest it would go.
After talking to Rod & Custom they said to turn the lower shock mount over
This is the ride height now with no weight in the car