I started looking at my original firewall insulation, and unfortunately, one of the three pieces (right side) is in rather poor condition.  

I found myself searching for options, looking at what others have done.  I found a few posts about the carpet snaps/posts, but not much about anyone who has found suitable materials to reproduce the look of the factory firewall insulation.  

I like the look of mass loaded vinyl in pictures I have seen, such as this: https://www.ebay.com/itm/373136954065

 

I have found by reading descriptions that "1 lb" mass loaded vinyl equates to 1/8" thickness.  I think that is close to what the original material thickness is.  The description for this particular item says "For automotive applications, use a decoupling layer of jute or closed cell foam."  

Anyone have experience with using materials that they would recommend?  

Mike (Zspert) still has firewall insulation listed on his website for sale.

https://www.zzxdatsun.com/catSoftTrim.php

Edited November 25, 20231 yr by DatsunZGuy