This "late style" spider gear fits Hewland Mk 9 open differentials made after 1999. Two required per differential. Uses Dished Washer for Spider Gear (Part No. 1410-B18), sold separately. Gears sold individually.
The late style is slightly larger than the early style, although both have 10 teeth. The washer bearing surface OD on this late style measures 1 9/16", and the maximum OD (measured across opposing teeth) is 2 1/8". The early style is about 3/16" smaller.