When you ran these on your runner did you run a double shackle in the rear or did you move the rear spring hangers? If you did the double shackle set up do you have those too?
The rear Mazda Springs mounted on new Relocated perches in the front (6inch forward), BUT you could just add a Front hanger and then Use Double Shackle setup on rear hanger so you won't need weld on new rear hanger. Just use a regular Shackle and Then use GM drop shackles at Summit for $40. I do Have some GM drop shackles I used for a short time, selling for $20. anout 3.5 eye to eye.
You need to measure up and see what length Shackle and what Length Drop shackle to use to get Best Angle And Lift Heigth.
Double shackle is Awesome !