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If actual damage, I do not know if the urethane can be repaired that will last...others will have to chime-in on that.
Since I am in the process of removing the paint off of my '81; are you going to be doing any of the prep work yourself? Is it only the original color, no repaint layer?
If you do replace the bumper cover, you could get a fiberglass one and then have the seam filled-in....very nice clean look. But then you would need to replace the rear cover and as well.
I am doing all the prep work myself; have front and rear covers off and paint removed down to the yellow urethene. If you need any pictures, let me know.
I am taking the body down to the fiberglass for the repaint as I am changing colors. Lots and lots of work done...and lots and lots of work yet to be done before it is ready for the paint shop.
Repair that sucker. Lots of legs left in it to my eye. My default is to always try hang on to original parts except where it's not possible or really not worth it.