I bought the compressors from this guy on craigslist. He was a really cool guy and gave me a great deal on a couple of York 210's, figured I would throw out what else he had for him. The belly up skid is pretty beefy, its essentially a beam that lifts the tranny 1.5" to get it above the bottom of the frame and then he has a solid plate that bolts into the stock holes.
TJ Jeep parts
He also has a few drive shafts and other odds and ends lying around that he's looking to get rid of.