Parts list: № Number Qty Name Options 1 19H2857 18 Cap Screw 3/4" X 2" 2 R78019 18 Washer 19.837 X 33.325 X 4.166 mm (25/32" X 1-5/16" X 0.164") 3 AT417016 2 Chain Sprocket 25 Tooth Lubricated Drive Sprocket, (SUB FOR T252552 AND T178482) Next page: ST37940 Track Chain Drive Sprocket (183589 - ) ST698301 Carrier Rollers, Standard and Extended Life ST37941 Track Chain Drive Sprocket (Maximum Life Undercarriage) ST75901 Lubricated Track Chain with 24 in. (610 mm) Shoes (40 Link) (183835 - ) ST75900 Lubricated Track Chain with 24 in. (610 mm) Shoes (40 Link) ( - 183834) ST74600 Lubricated Track Chain with 18 in. (457 mm) Shoes (40 Link) (183835 - )