Replacing leaf springs

check with espo springs & things--they can get u the spring needed for your application. They can also answer the bushing question.

Some years ago I bought j c whitney springs--great price& free shipping. the only problem I had was the installed bushing needed a bigger bolt--so I drilled out the mount & moved on.
I dropped the whole rear & rolled it out from under the car, matched the new springs up & rolled it back in,(don't tighten anything on the new assembly until all bolts are started.)

For your swap--wire brush all that scale on the bolts now, then soak them with pb blaster or similar.

brake lines might be nasty also. good luck,Lawrence