The box steel from a M that fits in the forward slot in the axle housing, that is used for clamping the drawbar suports to the axle won't fit in most slots on a 300 axle housing. If a steel tubing like used on a lot of 400 or newer drawbars is used, they are more rounded and will go in the slots most times and the complete drawbar less swinging drawbar from a M will work.
Regular M box clamp on left and later style pictured on right.
a15620.jpg

a15620.jpg
 
Have put drawbar from 300 on M but never the other way so did not run into this problem. Probaly could tack 1/4 inch (or so) spacers that wil fit 300 axle onto M box, they do not call me Red Neck Customizer for no reason.
 

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