I use a universal automotive ignition switch which came with 4 keys and are unique between switches. I have installed 3 or 4 of these and none had the same keys. Now a word of caution, these work very well on the 2 wire Yamaha switch installations, I need to research the 4 wire Yamaha switch replacement as I am not sure what the extra position is used for. This switch costs around $20 and is available at most auto parts stores. It also fits well in the existing hole in the dash. Please feel free to send me a PM if you want more info, or want to discuss over the phone.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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