Is the fiberglass type dash insulation available....?
I assume you're asking about the hardboard/fiberglass firewall insulation?
It was, not sure if it still is. I got mine, that I never used, from classicautoparts in OKC years ago. Would be difficult to package for shipping I would think, as it's bulky but flimsy.
I mean the insulation that's glued to the underside of the dash...2 pcs
I used A/C duct insulation on mine. I have never seen that stuff (OEM) offered for the dash.
I'm just now redoing mine since I have my dash out. I'm using the 1/8" Hush Mat all through interior. In some areas, like passenger side of firewall, I'll use the 1/2" stuff in lieu the factory stuff. It's expensive no matter which way I go.