Ariens Gravely 04594500 21601700 CENTER ShaftAriens 04594500 – Replacement MPN: ARI_21601700 CENTER- SHAFT Genuine Ariens Part # 04594500. Ariens Gravely 04594500 21601700 CENTER Shaft. Ariens Part Number: 04594500 Quantity: 1 Replaces Previous MPN: 21601700 Compatible with the following Models: Gravely Power-Brush 36 Hydro Gravely Power-Brush 36 Ariens Power-Brush 36 Hydro Ariens Power-Brush 36. We.