To add what Tim has said.....the steering of the narrow tri-rib will be greatly improved and will be easier for your dad. When I put a set on my 1200, it seemed like the front end was jacked up off of the ground and no tires were even on it---it turned that freely. I buy mine from Miller Tire for about $60/pr or $70 (maybe a little more) for tubes already in them. I would tube them to decrease the corrosion of the inner rim, but there are different schools of thought for to tube or not to tube, so you decide.
Cub Cadet 123
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Still don't know what I'm doing in OHIO?.....If you find me, then please point me back toward INDIANA. 
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