As mentioned GM only built the under hood part of the air conditioner system, the coach builder was responsible for the control system, evaporator, fan, etc. There were 3 or 4 companies that provided such parts, some of which are no longer in business. Some of them used parts from other companies such as the above mentioned Chrysler controller.
Your best bet is likely pulling your old unit looking for model / part numbers on it and googling those.
2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates