Z6 gearbox rebuild

ive recently been an idiot and driven my car for about 30 miles without any oil in the gearbox and since have had a slight wurring noise from 4th gear. im gunna be rebuilding my gearbox in the next couple of weeks and was wondering if there are any other gears from honda engines that fit? and if there is anything anyone can suggest i do perfromance wise when im building it?
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