Air compressors provide air supply to different parts of the engine where needed Mount Type: Two-Piece - Symmetric Head Outside Diameter (mm): 118 Head Outside Diameter (in): 4.65 Head Thickness (mm): 32 Head Thickness (in): 1.26 Pilot Outside Diameter (mm): 73.2 Pilot Outside Diameter (in): 2.88 Inside Diameter (mm): 17.5 Inside Diameter (in): 0.69 Mount Height (mm): 44 Mount Height (in): 1.73 Bonded Sleeve: Yes Standard Bolt Size: M16