The lowest price component in this Rear Caliper parts-list fiche is the Bolt.
Parts such as the Rear Caliper: Shim,outer, Bolt, Clip,pad Pin, Seal Set,piston are included in the Tl1000s 1997 (v) (e02 E04 E18 E22 E24 E25 E34 E39) / P37 Rear Caliper parts fiche.
With two applications this Bolt,housing is the most specified part.