On this parts fiche the Bolt, Washer Based (30x) is the most specified component.
The most reasonably priced component used on the Xt350h (20kw) 1988 59y Germany 2859y-332g1 Camshaft. Chain is the Bolt(1kh).
The thirteen Xt350h (20kw) 1988 59y Germany 2859y-332g1 Camshaft. Chain component parts are all listed in this schematic.