See the post(s) in General Discussion "Reproduction Endura bumpers are horrible" - unfortunately, GM discontinued the repair kits you will see pics posted of, but there is a guy out there doing repair work that looks to be a really decent deal.
I have a VE3, my original to the X77 I bought in '73, that needs help like I suppose most of them do - car was jacked up using the correct bumper jack/bracket (which is still in the car), but the bracket didn't keep the bumper from really getting messed up after it was jacked up a time or two. I love the design and appearance of the Hypalons, but they have been a problem as long as I have been around them to maintain/protect. Two weeks after a fresh repaint on the car in 1975, a Volkswagen rolled back into my Z and cracked the paint on the bumper. Talk about road rage -