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I don't think you can be sure of the bore by it's physical appearance. If you're limber emough you maybe able to measure from under the dash; the pushrod/ clevis is easily removable.
Also you maybe able to remove the mounting nuts on the firewall leaving the lines connected and pull the m/c forword enough to measure; usually there is quite a bit of "play" in the lines so as to allow you to do this. I know this from installing/removing fenderwell headers.
 
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