Part Number 70924235 - A New O-Ring (0.094" ID x 0.062" Width) For A Case 521D, 621, 621B, 621C, 621D, 721, 721B, 721C, 721D, 821, 821B, 821C, 921, 921B, 921C, W4, W14, W14B, W14C, W14FL, W14H, W18, W18B, W20, W20B, W20C, W24B, W24C, W30 Wheel Loader, Case 480F, 480F LL, 580C, 580D, 580SD, 580E, 580SE, 580F, 580G, 580K, 580SK, 580L, 580M, 580 Series 2, 580 Series 3, 580N, 580SL, 580SL Series, 2, 580SM, 580SM Series 2, 580SM Series 3, 580SM+ Series 2, 580SM+ Series 3, 580SN, 580SN WT, 590, 590L, 590SL, 590SM Series 2, 590SM Series 3, 590SM+ Series 3, 590SN, 680CK, 680CK Series B, 680CK Series C, 680E, 680G, 680H, 680K, 680L, 780, 780B, 780C, 780D Backhoe, Case 570LXT, 570LXT Series 2, 570MXT, 570MXT Series 3 Loader Landscaper, Case 6010, 6030 Turbo Horizontal Directional Drilling Machine, Case 8145, 1845B, 1845S Skid Steer Loader, Case 310G, 350, 350B, 450, 450B, 455B Crawler Tractor, Case 475 Cable Layer. Old Part Numbers Are D40356, S5598, 238-5005.