Looks like standard foam/heavy layer automotive sound proofing matting.
There's a few sources around, have a look at carbuilders website, but my recommendation would be to contact a company called Pyrotek and ask them if they have any stock of "Kenworth matting".
As the name suggests, this is what they stick in Kenworth trucks and is the same style of textured vinyl layer with foam underneath, although the foam isn't quite as dense as the stuff in your pic.
It probably has a technical product name, but Pyrotek in Dandenong knew it as Kenworth matt when I bought it from them - it's what I've put in my Defender.
				
			 
			
		 
			
				
			
			
				Dan
'14 Def 110
'75 Lightweight
'98 300Tdi Disco (gone)
'80 2Dr Rangie Classic (gone)
			
			
		 
	
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