I searched and didn't find what I was looking for. If someone finds it right away, I'm sorry. Anyways, I bought a pair of Superlift HD leaf springs for my truck (1984 K10) because they were cheap. I believe the model number is 01234-6? I looked it up on Superlift's site and the front spring part numbers were the same for a 1 ton and a 1/2 ton. The problem I am having is the front spring hanger bolt is smaller than the stock bolt and hanger. The simple fix would be to get a larger inside diameter bushing sleeve, but why would Superlift send them smaller in the first place?