The shackles I bought for my truck are Belltech shackles... I went with a company that seems to be one of the drop suspension leaders. They were reasonably priced at $80 here in Canada. That being said, a shackle is basically a shackle, and they would have to be REALLY poorly built for there to be much of a quality difference between one brand and another, in my opinion. If you go the route of removing the block between the spring and the axle instead, I would strongly suggest getting new U-bolts. Even if the old ones will work, they are not intended to be torqued more than once and could pose a safety hazard if reused.