Hi Steve, Bruce our site owner and forum administrator does know someone at Rover and I'm sure can make some inquiries as to the re-manufacture of the Model 45.
Re: Model 45 catchers, there is someone on eBay that is manufacturing catchers to a high standard for the 17" and 20" models and perhaps does 14" as well. They come unpainted, but that is a good thing if you are restoring and repainting a complete machine.