Spring question
 

I have a 85 4runner and my front springs have been sagging for a while and I have been wanting to do something about it. I just came across a CL ad selling rear springs from a 85 Chinook camper for $80.

(2) Leaf springs: (6 Leafs per Spring)....(surface rust, but excellent condition)

Leaf Spring Measurements:
Center of eye-loop to eye-loop (overall length).....,45 1/4 inches.
Front-Center of eye-loop to middle of center stud......21 inches.
Rear-Center of eye-loop to middle of center stud.......26 inches.

Is there value in this offer? Can? and How? would I use these?

I read on pirate4x4 i think it was that ya had to get histeer to run rear leafs on the front