Ah, I see from my ol' Super HD8 cattledog that you are referring to the Honda clutch pulley assembly.
Unfortunately can't help at the moment. I've mentioned before on other threads that parts and donor machines for the HD8's are much in need and thin on the ground. To that end I intend to collect a few for parts with the intention that parts be available free and freely to ODKers and other enthusiasts. Sadly, at the moment the collection stands at one 'red' machine and the clutch on these is of course different to the one you need. One of the problems is making the grave decision that one of these rare beasts needs to be relegated to 'donor' status.
If I can place a plug here, if anyone becomes aware of a HD8 for sale in sunny Queensland that may be at the end of its life and has a few organs to donate, please let me know.
Also, I've parted out 3 tractor series machines, 2 evolutions, 1 mini tractor ( and a partridge in a pear treeee

) and if anyone needs bits that they think I may have these are also available free and freely. No engine parts, just frames
Cheers,