Crawled under the truck to check on my exhaust getting louder. Found a hole in muffler and will be replacing with and MBRP cat-back. However, I found what I think are something like floor pan supports, rusted completely through/away. Can anyone verify what they are and/ where I can find parts to replace them?? There are three in each side but my only real issue ones are the front one on both sides. Under the footwell a roughly. Let me know! Thanks!