Genuine Triumph Oil Filter Change Kit.
Fits TF 250-X and TF 450-RC.
Kit Contains:
T1210378 - Oil Filter Element
T3600270 - O Ring, ID33.05 x 1.78
T3550547 - Washer, Cu, OD19 x ID14.2
T3600273 - O Ring, ID17.17 x 1.78
T3600272 - O Ring, ID12.5 x 1.5
Part 1A in the diagram