Parts such as the Clutch: Ball (5/8inch) (527 Ckd), Pawl, One Way, Boss, Oneway, Plate, Clutch 1 are included in the Pw80 1986 21w Europe 2621w-300e1 Clutch parts fiche.
The Spring, Compression (4g2) is the cheapest item from this partsfiche.
Of all the components used in this assembly the Primary Driven Gear Comp. is the most expensive.