You need a 3/8" wide belt. When I got my 100 from my dad and 149 from my brother they both said they were having problems keeping the PTO belts on them. They were both trying to use "A" width belts which are close to 1/2" wide. I picked up the correct 3/8" belts from the Cub Cadet dealer and have been mowing with the 100 for 4-5 yrs and have never had the belt jump off.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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