If you have 2 12 volts in a Box now, just measure the box then Google the batterys you want to use and get the measurements for certain. But yes 2 6volts should fit. I have always gone from 6 volt in a car to 12 volt and they fit the battery tray.
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2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
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