Hi Gavin,
The circlip in the first photo is from the rear brake drum bearing cover.
The last picture is from the rear drum brake bearing cover, I can dig up a part number if needed.
The third picture (No 27) also looks like one of the older type fork seals, with the cow hide seal. ( took mine out a couple of weeks ago, guess measuring the ID/OD will answer which one it is ).
How did you go with the air intake hose ?.