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It looks as though it has the chain drive and clutch rather than the belt drive. Engine is different as well.
Hello Alex
I have written about the Imperial here:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=72729

The Imperial never used the latter belt design.
The reel bearing carrier should fit your needs though ...

Many thanks for the images.
Please let us know how you go.

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Jack