If its any use to members with 45 who dont have a parts 'explosion" and listing,
http://www.midlandpower.co.uk/downloads/partLists/845158.pdf is a link to the parts for the 2003 print for model Rover 45 Reel Mower that they appear to be still selling in the UK. It looks almost identical with a few minor/superficial changes.
I wonder what these UK spare parts availability is for that model? Might email them an check on the height knob etc. $1 = 61 pence these days but freight would be a bit much I expect.
On that point, Deejay the selling prices seem to be GBP900 - 1100 on the various UK sites which now is about $1500 - $1700, of course excluding freight. Maybe if UK or SA are making these (they might have bought up the old Rover tooling & name rights for just the 45) maybe someone here (Bruce?)could be interested in bringing them in - in sea container quantities might be possible.
From my days in freight, I reckon that a 20' container would hold about 100 crated units. Still a big commitment for someone even if they cost $800 -$1000 wholesale. And then of course you would have to keep a percentage of spare parts for warranty. Still may be worth a follow up to the Uk by someone with the interest and the money.