I just bought my first M35a2 a few months ago and turns out it needed a lot more work than I had originaly thought. I dont think the last guy did anything to it because it basically needed everything. Fuel filters were so clogged I cant even believe it was running. Master cylinder had no fluid in it, wheel bearings were bone dry and about to lock up and all the axle seals were junk. Im not a diesel mechanic so I think I have sent more time researching how to fix the problems and actually working on the truck. Anyhow, I live in Florida and thought I would do something more in my field of specialty so I added A/C to my truck. Took about two weeks to complete and really was not as hard as I thought it was going to be. I have a mill and lathe so I made all my own brackets. I did some junkyard searching and found the perfect A/C blower assembly, the a/c lines and water drain were in just the right spots so it mounts nicely. I still have a few minor details to finish but sure is nice having ice cold a/c in my duece. I didnt add in any vents. Actually with no vents the blower motor has a crazy amount of air flow since there are not any restrictions of having to push air though air tubes. The entire cab cools down in seconds.