nos. 17 and 22 are soddin` huge.
as for the lighting; headlights are max. 60W; other lamps 21W except side lights 5W - work `em out, remembering 12V supply!
All other cabling appears to be low current ish - maybe alternator cables bigger,
Tip: if you put a wire in, and it "burns out", it wasn`t big enough!
HTH
p.s. suppliers: look at R. S. components mate.?