I have a 2010 Monaco Monarch SFS33, W22 Chasis, 8.1 Chevy Vortec, Bosal Mufflers, Part # W0006356. The tack welds for the shroud that wraps the actual muffler let go on one of them. The shroud is rusted out, but the muffler is rock solid and in excellent shape. I sourced some high heat galvanized sheet metal to fit as a re-wrap, however there is an insulation material that I need to source. The material looks to be 1/8" thick x 24" wide x 36" length. The muffler date is 2007, so its not likely asbestos. I've called a few places, but no joy. Any ideas what this material may be and perhaps where I could get ahold of some? Thanks.