How about get some measurements on your stock springs, like eye to eye and eye to center pin, spring width. Then check around to and see if there are any other springs that are close to matching your stuff, front or rear application.
Here is a little of what I know of Highboy springs and I'm sure someone will correct me. They are two and a quarter inchs wide. Most fords and chevys are three inch wide and you would need to change your shackles. After you grind the heads off the rivets and punch them out you'll want to redrill the holes and use half inch grade eight bolts (if the bolt holes line up). Here is a picture of the quarter inch plates I used to keep my stock shackles and springs. They are heavily gusseted on the back side and give me a four inch lift. Good luck!
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