Race-Tech - Showa Fork Oil SealSold as a pair Reference Chart Below Item Code Manufacturers seal ID# ID (mm) OD (mm) Height (mm) FSOS 31 P 31 43 10 FSOS 33 P 33 56 10. 5 FSOS 35 P AR 2050 35 48 11 FSOS 36 P BR 2708E 36 48 11 FSOS 37 P AR 8893 37 50 11 FSOS 3748 P 37 48 12 FSOS 39 P BR 2722 39 52 11 FSOS 41 P BR 2003 41 54 11 FSOS 43 P BR 3458 43 54 9. 5 FSOS 43C P BR 1922 43 54 11 FSOS 45 P AR 2050 45 57 11 FSOS 47 P BR 5639 47 58 10 FSOS 49 P BR 5481 49 60 10