The serial number plate is located on the drivers side of the Boler mid way just below the belly band as long as some previous owner has not remaoved it for some reason, which I have seen on lots of Bolers. As far as the spaer tire goes it originally had 3 bolts drilled into the
fiberglass on the rear it was not very strong. I had a spare tire/ bike carrier made that bolted to the bumper and the original holes in the back ot the Boler.
Rick