Try getting them from Brian aka Slammed1. Essentially the adjustable shackles that are used for flip kits, will lift your truck. This is because they are longer than the stock shackles and will give you some lift. Of course it will only do this, if you have your leafs above the axle, as they come stock.
I believe Thuren fabrication was making some lift shackles for the Rams. but they were doing it for the 2500/3500 Rams. I am not sure if they are making them for the 1500s as well. There was a thread about it, a short while back in the 4x4 forum.