All: I've put up for auction on E-Bay an add-on A/C system (with some of the hoses and fittings for it) which came out of another '66 F-100. If you are interested, here's the story: I currently have in my '66 F-100 a hang-on dealer unit, but the fan motor died. I bought the unit I'm selling to replace it, because it not only works, but looks like it will fit under the dash better, and take up less leg room, unlike what my current unit is doing. I took it apart, and cleaned it, and it looks quite good inside.
Well, my go to work car got hit by an uninsured driver, so my projects have to go on the back burner.
What I didn't put out on E-bay is that I DO have the condensor for the thing, but it is unorthodox. Works fine, is sealed, doesn't leak, but unorthodox. It is a large one (for better cooling) from a '74 LTD, and fits between the radiator and the radiator support. (The normal truck one, which I think is too small, fits in front of the radiator support.) Anyway, I am willing to sell (for a mutually agreeable price) the following A/C components off my truck, but only to folks like you all on this forum who understand the little extra work it takes to make projects fit.
1. Condensor, with drier and support bracket I fabricated.
2. Hose, compressor to condensor (pressure supply)
3. Hose, condensor to evaporator valve (pressure supply) This hose will require the proper fitting or an adapter to mate it to the valve.
4. Hose, from evaporator to compressor (suction return) This larger hose is about 3 feet long, but is cut, and will require a proper fitting to mount it to the evaproator. It MAY be possible to adapt this hose to the existing evaporator fitting right now.

The compressor mounted hoses are from the '74 LTD as well. They mount directly on the compressor, and fit Tecumseh/Ford/York compressors with the large threaded fittings on the top plate. These also do not have the earlier style fitting with the valve inside the fitting where mounts to the compressor.

I think it woud be easy to combine the hoses and fittings from the A/C unit and from my truck to make it work; you might need an adapter or fitting or two, but they seem to be standard sizes.