On this parts fiche the Pin,cotter 1.6x15 is the most specified component.
Parts such as the F-26 Step: Pin,bar Joint, Bracket, L. Step, Bracket, R.step, Collar No Bracket are included in the Gl1000k3 F-26 Step parts fiche.
The component with the lowest price in the F-26 STEP schematic is the Washer,plain, 6mm.