that is a good question. I wuld do aluminum as you are in the back. I am pretty sure mine only has the factory cardboard panel covering that opening, and tech has never questioned it. That being said, if an event occured in the trunk it could enter through the rear quarter openeings for sure.
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1968 firebird cameo white on red 400 4 speed
1969 carousel red firebird 455, richmond 5 speed
1964 gto pump gas, 505 IA2 EHeads, EFI, 92 mm turbo ice cream getter in process now....
1970 lemans hardtop, gto clone Atoll Blue
1972 Maverick powered by 2004 gto ls1 and t56 6 speed, 8.8, fox strut front end, wifes car
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