86 svo spring question

According to my computers interchange, it doesn't see a difference in SVO springs. It says 4cyl is a 4cyl. Here ya go:

Capri '79-84 Front
Capri '85-86 Front; 4 cyl
Cougar '81-82 Front; exc. XR-7
Fairmont '78-83 Front
Granada '81-82 Front
Mustang '79-84 Front
Mustang '85-93 Front; 4 cyl
Zephyr '78-83 Front

It does see a difference in the front struts though:

Mustang '85-86 Front; 4 cyl, SVO

I would leave the ones you have if they are clean, and not all rusty and rotted. I have a 302 in my 91 coupe that I kept the 4cyl springs in place, and the thing sits nice and low, and gets great weight transfer. I would leave it alone, if they are clean.