Bill,
Be pleased to help you out once you get the correct rear bumber! I do need an original front bumper for my 58.
Once you get the correct bumper, there are plenty of repop license plate holders out there, which incidentally, bolt to the reaf framing of the bed. I got mine from what was once Chevy Duty, but they all seem to ship with a 6 volt bulb, so you will need to change it out.
Going to NOLA in April, I will give you a status report when I return.