The Washer(12.5x20x1) is the lowest priced item on this Front Wheel schematic.
This schematic depicts all components used in the Ts125 1971 1972 (r) (j) Usa (e03) Front Wheel partslist.
A sample from the products for the Front Wheel include: Seal,oil(18x32x7), Spacer(12.5x19x52), Washer, Washer(18.5x24x1).