Kaiserjeeps is making firewall pads. Search his build thread.
I covered mine with foam and MLV. Gotta put up the pics of the vinyl.
Sic friatur crustulum
'84 GW with Nissan SD33T, early Chev NV4500, 300, narrowed Ford reverse 44, narrowed Ford 60, SOA/reversed shackle in fornt, lowered mount/flipped shackle in rear.