The Bilsteins that came with RCD kits are BE5-A092-T5 shocks. Extended=29.75, Collapsed=18.
They were ok with my setup, 6" skyjackers, no block, RCD shackle, and factory axle shock mounts. But were a little short and would pick up a tire easy.
Thread I made a while back.
On my new axle the shock mounts are clocked up and I think they fit just about right now. Gives me a couple more inches droop and doesn't bottom out too bad.
With that setup it rides good as far as I'm concerned. But does ride a little smoother with some weight in the back. I hauled about 600lbs of concrete the other week and it really took the "bounce" out of the back end.