I got one from Saturn Surplus about two years ago for a M35A2 that I was converting to a tanker... Somebody had chopped the rear harness while the truck was at the GSA yard. Price was right, harness was a little long, so it might actually have been off a M36... One thing that I found out upon install was that the Bendex plug where it attaches to the front harness under the cab was clocked wrong, had to rotate the plug two pin positions to get everything to work right, so if you do get one, check the circuits before you plug it up just in case (not a problem with the lights, but it was shorting out the power feed to the intank pump...).
Good luck.