The most reasonably priced component used on the Kaf620-a4 Mule2510 1998 Europe Frame is the Bolt-flanged,8x20.
The Frame assembly is constructed from several parts from which the Frame-comp,main is the most expensive.
A sample from the products for the Frame include: Washer,10.2x24x1, Washer,10.5x26x2.3,bl, Boot,steering Shaft,l, Nut,lock,10mm.