Just FYI, the shackles are made by Total Chaos, sold by PRG.
I have the Bilsteins and love them. Although I hear, for stock to small lifted trucks the Donahoes are better. Donahoe does not make a shock long enough for lifted applications though.
I've decided to wait until these come out. I can get the truck levelled and get much better shocks at the same time - all for the cost of replacing the shocks.
There are stock replacement shocks for $89 ea. from PRG. He sends you the new Bilstein shock with a stock coil spring installed. You send back your stock unit. This prevents you from having to dis-assemble, then re-assemble your stock coilover which is known to be a hassle.