I bought the brackets off a guy that was selling them on here awhile back. From what I have heard, if you buy them new, they are a little pricey. And the shocks, I do not know what length they are, but they are what came with the 4" Superlift. And as far as driveline vibration, I have not noticed anything at all, and I have already been down the highway with it with no problems at all. Just need to get the brackets welded to the axle, they shift back and forth under quick breaking and acceleration.