Here's a recent thread on the Goodmark Rechromed bumpers, everyone that has them says they are great, me included:
https://67-72chevytrucks.com/vboard/....php?p=9014827
It does appear you can't currently get them, or there is a long wait.
GMCPauls offers a 'Premium Grade' bumper that others have said are great:
https://gmcpauls.com/bumpers1.htm