While the 123 sub-frame and mule drive will most likely bolt onto and hang under your 125, the proper mule drive for your 125 is a "quick attach" style, the 1X2/3 series tractors weren't equipped with the quick attach system.
If you are in fact using the 123 sub-frame and mule drive on the 125 my best guess would be that you would use the 123 size belt. Please understand that I have never done the exact swap that you have and and can give you no definite answer, just an educated guess.
Hopefully, someone who has done exactly what you have, will come along with something more concrete.
Good luck
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