Air compressors provide air supply to different parts of the engine where needed Mount Type: Two-Piece - Non-Symmetric Head Outside Diameter (mm): 91 Head Outside Diameter (in): 3.58 Head Thickness (mm): 28.8 Head Thickness (in): 1.13 Pilot Outside Diameter (mm): 50 Pilot Outside Diameter (in): 1.97 Inside Diameter (mm): 16.8 Inside Diameter (in): 0.66 Mount Height (mm): 60 Mount Height (in): 2.36 Pad Height (mm): 25 Pad Height (in): 0.98 Bonded Sleeve: No Standard Bolt Size: M16