The Pin 20x20 is the cheapest item from this partsfiche.
This schematic depicts all components used in the Jr50 2005 (k5) Usa (e03) Front Wheel partslist.
A sample from the products for the Front Wheel include: Shoe & Spring Set (nas), Rim,wheel, Spacer(10.2x16x47), O Ring(d:2.4,id:9.8).