Air compressors provide air supply to different parts of the engine where needed Mount Type: Two-Piece - Non-Symmetric Head Outside Diameter (mm): 33.3 Head Outside Diameter (in): 1.31 Head Thickness (mm): 12.3 Head Thickness (in): 0.49 Pilot Outside Diameter (mm): 19 Pilot Outside Diameter (in): 0.75 Inside Diameter (mm): 9.9 Inside Diameter (in): 0.39 Mount Height (mm): 31.8 Mount Height (in): 1.25 Pad Height (mm): 12.3 Pad Height (in): 0.49 Bonded Sleeve: Yes