Evaporator box foam

[Rad_Comanche]

Hey everyone, got myself a bit of a dilemma here. I was changing out my heater core, which requires removing the evap box. Unfortunately, the shaped foam piece that goes in the hole between the firewall and the box ripped almost in half.

 

Being a 35 year old truck, I cannot imagine there are any of these laying around. Has anyone found a solution for replacing this?

[ghetdjc320]

I used a piece of hvac insulation and kept trimming pieces until I got a nice fit. Works great that way.