Just got my front bumper trim from gmparts.com today. It was shipped coiled up in a small box. From looking at the backside it is just one long piece of rubber with the sticky back. The red tape on the back is protecting the sticky surface. Looks like it is going to be an easy installation. Just remove the old and stick on the new. See no evidence for retainers or having to bolt it on to the bumper. I am going to take it to our maintance hanger this weekend. A couple of our aircraft mechanics who also work on cars said they would give me a hand. Will post results after the installation.
I meant to say I got the part from gmpartsdirect.com