You can buy sound deadening sheets made by a company called Henkel under the brand name of Teroson.
Teroson - Brands - Henkel
They supply most of the OE market with sealants and sound deadening sheets and quality repairers use them. They are more or less sheets of bitumen material. If you stick a few of those on you should be ok. You might want to also fill that area with some of their foam. This should also help to stop the back wall from drumming.
I have had more VW bugs and Kombi's than i care too think about and all have had this stuck onto and into every panel and cavity to keep noise and vibration levels to a minimum.
Hope this helps.
D2


 
					
					 
				
				
				
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