I had a 76 with AFAIR Alpinaire hang on, I presume aftermarket with a Kirby compressor low down on the LH side. The belt tensioner was always doing bearings as it was at about the lowest point of the belt run.
It had a fabricated steel mount.
Regards Philip A
I had an 81 in Saudi Arabia witha similar hang on again with a big piston compressor, fitted on an alloy bracket high on the RH side of the motor. I am pretty sure that one was factory as the bracket was a casting and nobody in Saudi Arabia at that stage was capable of fitting an airconditioner.

