1980 Buick Park avenue Rear Bumper

I have been searching for a rear bumper for my buick for the last number of years. the car is in very good condition - original paint no rust solid doors except for the rear bumber that has holes rotted into it. I hope someone may be able to help me locate one. My next option is to weld pieces into the one I have and have it dipped for chroming. any help would be appreciated

Duce