NHRA rulebook for 7.50 or slower says .024 inch steel or .032 aluminum. Bulkhead must isolate driver compartment from trunk. Doesn't say how to mount it.

Fireproof caulking

2003 Dodge 3500 Diesel

1964 Plymouth Savoy White 2dr sdn. 512 stroked, Dominator, New Best 9.75 @ 138.50mph
2019 Challenger Scat Pack 1320 White Knuckle-K&N Cold air filter, Billit Oil catch can, drag radials stock 11.911 @ 114mph