I think I have solved the mystery of the chain drive assembly.
I was looking around the place and came across the Manuals and parts list which has a downloadable pdf of the 33 with an exploded view of all the parts. see attachment at the end of the post
First cab off of the rank up the top of the page it says written in handwriting "Chain Drive"
Then the next two say written in handwriting "Belt Drive"

I would like to also bring to your attention number 71 on the same diagram curiously (now I stand to be corrected here) that looks like a certain unpainted spacer on my unit and the other one that Sir Chook posted too.

I wonder if the clutch cone from this page too is the same or a superseded number for the 45 clutch?

This all looks pretty factory after all!

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=6371#Post6371
Then click on the model 33 link.