Alfa-Fiat-07-6V12-PV6

SANDEN started producing automotive air-conditioners and SD compressors for automotive air-conditioners in 1971.

http://www.compressor-express.com/ac-compressor/alfa-romeo/Alfa-Fiat-07-6V12-PV6

Some Alfa Romeo MiTo are built with the same air conditioning compressor. The Original Equipment Manufacturer Numbers (OEM numbers) are Alfa Romeo 51803075, 51893889, 71724084, 71792267, 71793961.

The air-conditioning system of these vehicles was assembled with a Sanden 6V12 compressor. Manufacturer numbers: Sanden 1461, 1921, 1921F.

These ac units seem to be interchangeable.

Alfa-21-DCS17IC-PV6

ZEXEL compressors being a vane type compressor are notable for their near silent operation and a variable displacement capability meaning they did not cycle on and off resulting in much smoother engine running.

http://www.compressor-express.com/ac-compressor/alfa-romeo/Alfa-21-DCS17IC-PV6

Some Alfa Romeo 159, Alfa Romeo Brera and Alfa Romeo Spider are built with the same air conditioning compressor. The Original Equipment Manufacturer Numbers (OEM numbers) are Alfa Romeo 50514055, 60693333.

The air-conditioning system of these vehicles was assembled with a Zexel DCS17IC compressor. Manufacturer numbers: Zexel 506041-0092, 506041-0095, 506041-0096, 71789102.

These ac units seem to be interchangeable.