Found this online for a 1970 GTO (see below). It appears that the underhood lamp option appears on PHS docs as a line item (see second to last item in left column).
I guess that since I don't have that listed on mine, it wouldn't be correct to install. How does that impact the underhood insulation? I assume there is only one insulation option with the cutout for the lamp and non-optioned cars would just have the hole, or was there a different version of the insulation?
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1970 GTO (Granada Gold) - 400 / TH400