Hi Ironbark,
now you are talking my favourite mowers the 24's I love them they are fantastic. I still have 3 here waiting to be rebuilt. As for the motors just keep an eye out for any full crank that turns up your way. At worst I usually only have to put a set of rings in them and they will tackle anything you throw at them. Front wheels I usually remove the stub axles ( those 9/16th axles are a pain on ALL Victa mowers) and put a decent set of wheels on them. Usually the front axle has chewed the housing out and that can be a big problem. I have a length of 40mm Delrin that I make new bushes from and hold them in place with "U" bolts. That fixes up the front, sometimes the back axle needs a bit of repair work but that is fairly easy. Do not throw any of those parts out, they are all important so we can keep these machines going. As long as these 24's suit the F/C motors that is fine, with the ones with PT's fitted, now that is another kettle of fish that I think I solved the problem with those a couple of years ago.