MTH electro couplers fit in the Williams G no issue. I have converted many Williams scale G motors to PS2. I would not waste my time putting in a 5 volt board. Go for the PS3 upgrade and you will be in good shape. Those 5 V boards are like time bombs. I know you will not like what I said but if you go with the upgrade kit you will have the correct length couplers and all the lighting you may need.
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