Could someone PLEASE post a picture of the underdash A/C unit that came with the '75 or '76 911s????

My '76 911s did not come with it. My mechanic says that all of the lines are under the car, but I would need a compressor and the unit to outfit the car with A/C...So I am assuming that somewhere down the line the unit was removed...

I am upgrading to a 3.2 and would like to add A/C to the car and I want to know what the unit looks like.

Thanks.