Factory integrated air
Inside cab
Dash controller, inner firewall heater core cover, heater core, ducting, right plenum vent block off.
Engine bay
Outer heater box cover with evaporator and receiver drier and four speed fan, compressor and mounting kit, wiring harness and vacuum control hoses, vacuum control heater tap, condenser and thermo fan, triple or twin belt bottom crankshaft pulley.
Probably other bits I have forgotten. Best way is to buy a complete setup. They are difficult to fit as you need to pull complete dash out and the outer cover on the firewall is hard to fit with engine in (not impossible though). You will need a new drier too.
You can buy new compressors to suit and new hoses can be made.