Any of the heat barriers should work, either a non adhesive sheet of the same stuff used in tape or a slightly thicker version like the stuff some use to insulate a transmission tunnel. I think the flexible stuff would be easier than a hard aluminized sheet that might crinkle up, but I would also stay away from non covered stuff like header wrap material or wool like insulation that will shed a lot of fiber under the hood. Just poke a couple of holes for the two tank legs and a slit for the bottom hose.
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