Mystery compressor

Hi,

You're going to have to help us with a little more information. That P/N is mid to late 70's. The basic compressors are all pretty much the same but there were differences in drive belt arrangements. These have more to do with the clutch on the compressor than the compressor itself. Slant sixes got smaller displacement compressors and they often had single drive belt pulleys. Small V8's in the 60's also had single drive belts up to about 1970. Big V8's had dual drive belt pulleys.

So, what engine is in your 66, and what does the clutch pulley on the compressor look like?