Ariens 53900500 – Replacement MPN: 53900500 Genuine Ariens OEM, Part Number: 53900500 GEAR CASE ASSEMBLY – 22 ALUM. Genuine Ariens Part # 53900500. Ariens 53900500 Gravely Gear Case Assembly 22 Alum. Ariens Part Number: 53900500 Compatible with the following Models: Ariens Sno-Tek 28E Ariens Sno-Tek 26E Ariens Sno-Tek 24R Ariens Sno-Tek 24E Ariens Sno-Tek 22R Ariens Sno-Tek 22E Ariens Compact 26 Ariens Compact 24 Ariens Compact 22 Ariens Compact 20. We are proud to be a factory authorized retailer. We use several different carriers and choose the most economical for the item and destination based on the estimated transit time displayed. FixMyToys – A Division of Ball Equipment.