They may or may not fit over the plastic part of the hand guards, but if they don't the plastic part can be removed and the muff kept away from the hand levers by the metal part of the guard.
For mirror mount holes, a pocket knife would probably do the job. The edges can be hit with a soldering pencil or a butane lighter to prevent fraying.
They're only twenty bucks, very possibly worth the gamble.
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Horse holder at Madame Orr's House.
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