If you search hard (really hard) you might find all my old info. I used a prothane coil insert made for Ford prerunners. I ordered the 10" long versions thinking I would cut them down, but 35's the tire just gets into the upper fender on a hard compression so I've left them alone.
I removed the stock bump stop and bolted on a piece of 3/8" steel. There is a hole in the insert just about the same size as the tower and without the plate it will ram down through it.
The are made to be a progressive bump and they work well for that. Mine contact after about 3" of up then I get another 2 or 2.5 until they stop on my setup.
Not cheap though. I think I paid around $70 for the pair from
www.bajaconcepts.com. I would bet any desert shop would have them though. I like them and would use them again. If you have a small tower in the coil already (mine are stock 70's Ford mounts) you could probably get the shorter stacks and they would also be less progressive. I would buy long ones and cut them down until you get the travel you like.
Click on the "coil inserts" link.
http://www.prothane.com/pages/productguide.html