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