I did use the pop rivet kit, worked just dandy.
Kevin, you might be able to find individual grill bar parts so dont give up easily. Sometimes the fun is in the hunt. I am going out to Ron's auto wrecking this week, they have an AD out there, I'll take a look see at the grill and report back.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration