67 shortbox 4x4 lift kits.

[674x4nebraska]

New to the forum and looking for some more input. I'm looking for a 4inch lift my my 67 c10 4x4 and I have found some places that say they are the same from 67-72, and others that claim they are different. I was under the impression that the front springs on a 67-68 we're wider at the shackles than the perch, which I can confirm on the springs that are currently in the pickup. I was thinking that from 69-72 they were 2.5" from shackle to shackle. Are the front springs what are different on the pickups? Is it the rear springs? Or is there no difference? Would like to only have to order things once so any help would be great.