Bad Boy 050-2074-00. Fan/Pulley Kit for MZ for years 2012 thru 2016.

alt. HG 72124

Ariens 21543898

Hustler 601941

Includes the following: 

44133 Nut 1/2"-20
53804 Pulley 
53812 Pulley Hub
53821 Fan 7" (10 blade)

SR-4