A/C vs. Non A/C fire wall

It does lose some of the integrity that the ring gives to support the heater box. but with the firewall pad it stays snug and does not move around. I can grab it with force and move it. Currently, I am looking for a piece of non a/c firewall to weld in behind it. I just have problems parting cars that can be fixed. lol...

The car is a non a/c car that someone converted through the years. While I have most of the pieces to add a/c to it if wanted it just looks too crowded in the engine compartment and it doesn't get that hot here.