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Please ignore previous comment. jweaver has confirmed this DOES fit MK3!
"I went back are read the comments and realised he was talking about the mount.. BUT..
Ignore me as it DOES fit.. There are 4 holes not 3.. 1 was in the shadow.
So please add MK3 in the title again as its a perfect fit.. The only thing I am going to do to change is to move the screw holes 1-2mm as my motor touches the box.. This is because I have my motor rotated 45 degrees due to an upgrade that helps with tensioning the belt, and because of this, the corner of the motor just about touches the case.
But if I move the screws to the right, it will push the box over to the left.
This isn't likely to affect many people, so I wouldn't worry about. "