Vin Plate rivets???

[smallblk77]

I have been around cars allot in my past but just got my first old truck. I bought a 69 Chevy C10, fleetside long bed. It was rusted really bad around the rockers and cab corners. A guy was refered to me through a friend to fix the rust and get it ready for paint. When I first got the truck back I didn't notice that the vin plate and the little plate under the Vin had been messed with. It took about 2 weeks of me messing with the truck to notice that the rivet were regular rivets. I checked the Vin against the title I have and it is still the same. I contacted the guy that did the work and he said he took it off to put a new peice of metal behind both plates to fix the rust issues. He said that since I have the title with that vin on it that there should be no problems with the other style rivets. Is this true and if it is not where can I get some of the right rivets that belong in the truck.