I don't think they were using meatal back then but please don't bank on that! I will be interested to know if anyone has some first hand information.
You could remove the inside cover for the air conditioner and see first hand what type material you see.
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2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Companion Std hitch
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