Some items from this specific schematic: Horn Comp.(high), Fuse, B5, Bolt,flange,6x12, Fuse,a10.
The Bolt,flange,6x12 is the cheapest item from this partsfiche.
This F-33 Wire Harness-horn diagram displays the required parts for the Gl1100d 1981 (b) F-33 Wire Harness-horn.