Parts such as the Step: Pin,step Bar, Pin,cotter 2.0x15, Holder L,step, Bolt.cap,8x16 are included in the St1100p Paneuropean 1996 (t) England / Mkh Step parts fiche.
In this schematic the "Bolt,special,10x3" is used most often.
The Washer,plain,8mm is the cheapest item from this partsfiche.