The front one-way is a great option.
The front one-way does not fit on the 37 tooth pulley. The pulley internal diameter is to small to allow the one-way through the center. (I only just found this yesterday while trying to fit the one-way to my 501XWCE.)
The options are
Use the 35 tooth pulley that comes with the one-way kit. This will over drive the front wheels - by a lot.
Or purchase the 36 tooth pulley and adaptor plate, still over drives the front wheels.
Or drill out the 37 tooth pulley to fit.
Or purchase the centre one-way kit. (this is my choice because you can keep the front diff and the same drive front and back.)
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