On this parts fiche the Spring,brush is the most specified component.
Parts such as the Starting Motor: O Ring, Bracket Assy,fr, O Ring(d:3,id:24.5), Armature are included in the Lt160e Quad Runner 1991 (m) Usa (e03) Quadrunner Quad-runner Starting Motor parts fiche.
The Starting Motor assembly is constructed from several parts from which the Motor Assembly,starting is the most expensive.