Parts list: № Number Qty Name Options 1 19M7417 18 Cap Screw M16 X 65 2 T315865 1 Drive Sprocket SUB FOR AT355076 3 R73290 18 Washer 16.280 X 27 X 2.670 mm (41/64" X 1-1/16" X 0.105") Next page: ST27319 Track ST27320 Undercarriage, Mid Life Wear Kit ST27321 Undercarriage, Full Life Wear Kit