Application: Commonly Used in The Super Z, Super Z HD, Diesel Z, Super 88 Rear Discharge Models (Idler Tensioner Arm) - Select BAC-VAC (Idler Tensioner Arm) - 109549 is Used with 770867 Plastic Bushing (The Wear Item Separating Rotational Metal Part from Each Other) - 109549 Insert Into 770867 and Enable the Idler Arms to Rotate as Well as Giving a Stable Center Point to Allow a Fasteners to Retain the Idler Arms. Size: N/A - Inside Diameter is Sized for a 5/8" Fastener. Notes: Review the Parts Diagrams in the Images Above (Organized by Family/Series & Usage Type) & and Model Fit Chart Below to Ensure a Correct Fit. 109549 Steel Pivot Idler Bushings Will Need to Be Used with a Wear Item 770867 Plastic Bushing in order to Fit Properly and Eliminate Wear from Metal Rotating on Metal - If Wear is Experience on 109549 Consider Replacing 770867 Plastic Bushing at the Same Time. Model Fit Chart Select Early Models - X-ONE Models - Idler Tensioner Arm, Same as Super Z Models are Currently Not Listed 2011 - Current Rear Discharge - Super Z Models - Idler Tensioner Arm 930024, 930065, 932053, 932061, 934216, 934224, 935023, 935064, 936914, 936955, 940031, 940049, 941195, 941203, 942862, 942912, 943910, 943944 2013 - 2022 Rear Discharge - Super Z HD Models - Idler Tensioner Arm 932178, 932186, 934307, 934315, 934935, 934976, 937011, 937052, 941245, 941286, 941559, 941567, 943035, 943043, 944025, 944033 2018 - 2025 Rear Discharge - Diesel Z Models - Idler Tensioner Arm Models are Currently Not Listed Will Be Eventually All Models - Super 88 - Idler Tensioner Arm 936617, 939546 Not sure if this is the correct part? Contact us with your Hustler model and serial number and our parts team will verify fitment before you order.