JUST that one model year. Perhaps a New Yorker model would also fit? There were some smaller bumper guards which could be optioned on either one, too.
Seek out a "bumper remanufacturer" in your area/region. They used to be plentiful and supplied the body shop industry. With increasing emissions issues with re-chromers and the use of "bumper covers" on all vehicles since about 1978 and later, many have shifted into the HD truck realm of things, by observation, where big chrome bumpers can still be "king".
Finding a useable front bumper in a salvage yard can take a while. Most wrecks happend on the front end of the vehicle. Most but not all. So you can still find one from a car whose engine kaputed. Seek out a salvage yard away from the metro areas, which might specialize in "older cars" as their main business.
A bumper is straightened just like normal sheet metal, except for heavier metal to be worked. Request an "OEM" finish like it had when new, NOT a "show chrome" finish (which is too shiny, slick, and MORE expensive).
Depending on the size of your "dent", you might get the whole bumper assy, including brackets to the stub frame rather than just the bumper. Might cost more but could be easier to deal with in putting it onto your vehicle.
Just some thoughts,
CBODY67