I bought this system when we had some lodged corn and it worked great to get under the stalks without running the head into the dirt. I ran this system on both an 843 and 893 cornhead - both times in front of a 9600 combine. This is an older Headsight system with 3 sensors/arms, a black box that mounts to the back of the cornhead, and all wiring harnesses. This system gets power from the dial-a-matic connector and height is adjusted with a separate rotary knob that mounts in the cab. The box with the knob has 5 lights showing the height setting. Arms on sensors have the extensions and are only a few years old. There is 1 harness that will need to be repaired before it can be used (simply splicing together some cut wires - nothing major).