the foam soundproofing on the back of my car's engine cover has mostly disintegrated, can anyone suggest a worthwhile replacement? I've seen some threads around the internet of people using sticky-backed silver foam stuff which looks decent but not been able to find it with a google. 

Comes up on Ebay / Amazon / Wish etc

 

key words like.

High temperature reflective engine bay thermal acoustic bonnet insulation glass mat

Engine compartment insulation fire wall sound deadening stick on