Replacing engine room & generator insulation/sound barrier

The engine room entry door insulation/sound barrier has deteriorated (fallen apart) and I need to replace. It's 21"x21". The exposed side looks like aluminum foil on the insulation. I would like to also replace the insulation/sound proofing that is on the generator cover although it is different material. Any suggestions on where to find a good replacement insulation/sound barrier. I've talked to Cabo (Brunswick) and they aren't much help. Also talked to Sam's Marine but they don't sell it. That good Cabo service seems to have gone with Brunswick.