1957-1958 Firewall insulation

[charles in Dallas]

I have a 1957 Series "75" that came missing the firewall insulation. I did not find out until I took the dash pad off. The suppliers look to be ~3 months or so to deliver, I hate to have my car apart that long. Can I make one that is sufficient?
Rock wool or fiberglass with a Dynamat backing?
Thanks,
Charles

[David King (kz78hy)]

I have some for a 57/58 Brougham, not sure what the difference is.  These are the plastic pieces and you would have to add the insulation to them.