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If the ones from your mice will not work. there are plenty of photo transistors available from some of the surplus electronic parts suppliers and Mouser, DigKey, Vishay and Jameco carry some also. Of course shipping charges might be an issue with certain suppliers.
You will have to choose what looks like it will work.
You might want to check the little collector bypass capacitor on the photo transistor just in the course of things, if you have not already done so.
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