The compressors measurements are:
Overall length with the clutch: 7 1/4″
Overall height without fittings: 5″
Horizontal mounting ear distance: Inside 2-11/16″ outside 3-1/2″
The compressor includes vertical O-ring fittings.
#8 discharge fitting 3/4″-16 threads
#10 suction fitting 7/8″-14 threads
This compressor can be used with R-12 or R-134a.
The difference between a 508 compressor and a 709 compressor are the output and the number of cylinders. A five series compressor has five pistons, a seven series compressor has seven pistons. The seven series compressor has more output (CID / CC).