pics! are they little ones or are they big? If they are the little ones they were for attaching points for engine crank, jack extentions, etc. But if they are big (3/8" plus), perhaps a PO had an after market roll bar in there.
Trollhole had a 73 back in college and he's got a pic on here somewhere, but he had the gas tank holders on the side....guess that was all good till people started wheelin LC and slid into that first bank and decided it wasn't good to have a gas tank strapped to the side.