Parts list: № Number Qty Name Options 1 FF531112 1 Bottom Roller SUB FOR AT332621 AND AT444699 1 AT314421 1 Bottom Roller SUB FOR FFSB106675 2 19M7968 4 Cap Screw M20 X 130, SUB FOR FFSB109228 3 12M7070 4 Lock Washer 20 mm, SUB FOR FFSB109365 4 14M7277 4 Nut M20, SUB FOR FFSB109330 Next page: ST146991 Track Chain Roller Components ST146992 Track Chain Roller Components (Replacement) ST146989 Track Lower Roller and Mounting