Greg,
This car had very few of the expected factory options.... I.E. manual mirrors, no cruise control and (yes,) no factory A/C. When I got the car it had 1970's era after market A/C and most of the components were missing or broken. I had a choice to remove it completely or replace it. I chose to replace it with a new under dash unit as finding a complete period correct conversion would have been difficult if not impossible.
Thanks
Bill