So what's so bad...
Reply #7 –
My fronts are stock springs off a 95ish Mustang. They had the same wire thickness and coil "spacing" as a T-Bird lowering set my local shop had (with one of the fronts missing from the box), just had a few more coils, which made them taller. I cut about 1 1/8 coils off of them, which still left them a bit taller than the remaining "lowering" spring was, with similar stiffness. I used the rears right out of the box.
Cutting fronts is easy, as the lower end is "open", and locates in a trough in the lower arm.
The rears will be harder, since both ends are "closed". Bottom end is a small flat loop to fit the pad/locator on the arm, the last top coil is also wound flat to lay against the upper pad.