A friend of mine has a complete I  think early 50's Caterpillar  d4 it has the hydraulic cylinders outside the tracks and has a manual angle/tilt blade. It appears to be complete even has a ROPS and good looking seat cushions dry rotted I'm sure. The only thing that doesn't look original is the gas tank for the pony motor. If any one wants a easy restoration project or display for their equipment business this will be hard to beat.  It can be bought cheap if interested my number is 205-625-2820. machine located in north Alabama.