Parts such as the F-25: Bolt,flan.10x200, Nut, Flang, 10mm, Body Comp*nh-138*, Bolt, Eng.hanger are included in the Mt50s 1987 (h) Belgium F-25 parts fiche.
The Honda F-25 has seven products enlisted in the schematic.
The most reasonably priced component used on the Mt50s 1987 (h) Belgium F-25 is the Nut, Flang, 10mm.