Air compressors provide air supply to different parts of the engine where needed Mount Type: Two-Piece - Non-Symmetric Head Outside Diameter (mm): 115 Head Outside Diameter (in): 4.53 Head Thickness (mm): 30.5 Head Thickness (in): 1.2 Pilot Outside Diameter (mm): 61.7 Pilot Outside Diameter (in): 2.43 Inside Diameter (mm): 21.5 Inside Diameter (in): 0.85 Mount Height (mm): 72.5 Mount Height (in): 2.85 Pad Height (mm): 25 Pad Height (in): 0.98 Bonded Sleeve: Yes Standard Bolt Size: M20