Jeeps use 1" bushings and wranglers use 1 1/4" bushings, so if the springs were designed for a Jeep then use the 1" bushings. Blue bushings come from BDS. They may be like OME's with 2 halves and a steel sleeve inside.
Either the 3" or 4" (1/2" lift) will work fine with your springs. Personally I'd go with the 4" for a bit more flex but your 4 1/2" springs alone should give you plenty of clearance.
The end of a defining era.... JEEP R.I.P. 1941-1986
My frame off Re-Build: (the 4 year saga....)
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