New aluminum 3.7″ 2300 AXM Whipple supercharger pulley. AXM style was found on 99-03 Whipple Supercharged Chevy trucks with AXM style superchargers.
Note: Some users have reported the need to machine down the diameter of the casting behind the pulley due to casting shift. This service can be provided, if necessary. It requires removal of the front cover. The cost is $47.50. Maximum diameter to avoid machine work is 3.285″ (83.3mm).