[starvinartis]

If your dually rear came from a cab and chassis 1 ton, it should have 40 1/4" center to center mounting pads, so should bolt right to the existing Blazer leaf springs, which are also 40 1/4". This is the narrower dually rear end. The "cowboy" pickup one tons are a wider unit, usually a D-70, and not sure what the spring perch set-up is, but again they should have 40" leaf centers, as do most 1 tons, 2 or 4 wheel drive. Sigle wheel 14 bolts from 3/4 tons have 42" leaf centers, but the single 1 tons are again 40 1/4", at least on my 4x4. I do have a single wheel 14 from a 4x4 if needed.