Like @veiloctane posted earlier in this thread, I am providing the following part numbers in the hopes it helps out fellow HDJ81 owners, as it has been quite the task to figure out A/C part numbers. For the record, I have a 1991 HDJ81 (RHD) with a single A/C (no center fridge!) that is R-12 based. I've decided to stick with R-12 and not convert.
I have ordered the following parts because our compressor died and upon having a leak detection the system had two small leaks, one near the suction hose at the metal crimp fitting near the compressor, and the other on a fitting attached to the condenser. I have included prices (USD) as well for additional help.
Denso 471-1433 A/C Compressor ($211.79)
Denso 475-0107 A/C Expansion Valve (located in the cab near the evaporator core below the glove compartment) ($23.79)
Denso 478-0107 A/C Receiver Drier/Accumulator ($11.24)
Denso 477-0122 A/C Condenser ($149.79)
Denso 476-0062 A/C Evaporator Core ($111.89)
Toyota 88712-60130 Hose, Cooler Refrigerant Suction, No.1 Toyota ($219.28)
I will post back with additional info once I get the parts and get them installed and the system recharged. Thanks!!