This seal is used from Comm. No. TS5556 onwards.Earlier cars from Comm. No. TS1 to Comm. No. TS5555 use Seal 103811

The seal change was due to an increase in the size of the hub diameter where the seal sits at commission number TS5556.

Whilst in an ideal world it would be appropriate to order the correct seal according to the commission number of the car, it is of course possible that the hubs have been changed, or the complete axle. With this in mind the following internal sizes of each seal will prove a useful reference. Remember that the size of the hub the seal rotates on will be larger.  

 Seal internal diameter: -

103811 36.83mm (1.45")

109543 39.62mm (1.56")

This part appears on the following Triumph Catalogue Plates