In saying the first drive sprocket needs replaceng and it been a Rover Thoroughbred are the parts still available, Or is this the nail in the coffin for the old girl?

I do have a 14"Scott Bonnar 45 I pick up for $20 I can put the kirby on to this, Unlike the thoroughbred there are parts still available for the SB.

The catcher is in pretty good condition.
Witch way would be best here the restoration of a 14"Scott Bonnar 45 or Rover Thoroughbred 16"?
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