You don't have the owner's contact information? If you bought the bike at a pawn shop, I'd highly suspect it of being stolen and would have your local police department run the serial number of the bike to make sure.
Other than that, you may have to drill out the bolts in some way. A local bike shop might have better advice or some experience with this issue.
Scott
He seems to have changed mobile number or something. It was a private transaction and I am pretty confident it wasn't a stolen bike. Thanks for your advice. If anyone else get add to it or confirm it I'd really appreciate it.