My 2015 Sierra crew cab was built October 10, 2014, in Mexico, and has the muffler but no bracket. I took the truck to a dealer last week to have the air bag deployment recall done, and asked if they could install a bracket. They checked and said my VIN didn't show up under the bulletin, so didn't need the bracket. I had already bought a bracket on Ebay, so when it arrived, I went ahead and installed it. My A.C. line looks like all the photos I've seen of lines needing a bracket. With my luck I'd eventually have to take my truck back to the dealer some day with a leaking A.C. line, and ask them why it cracked since they said it didn't need a bracket. I'm sure they'd remember and offer to repair it at no charge.