I'm doing a body off resto on my 1979 FJ40 and I have come across an original air conditioning unit, I think. It's a black plastic unit that's kinda bulky and the exit vents (only two)are small. The word Nipendenso (spelling?) is stamped in several places. I am told that the 79 is different. I am a stickler for detail and this truck will only have original type equipment installed. Anyway can some one help me decide what to offer? I have no idea what it's worth and don't want to miss out if it's rare.