You should be able to pull your interior trim and see your original holes from the inside. You can then drill them from inside out ( they just fill them with bondo) then place your bracket over the outside hole to locate the original screw holes. At least thats how I did mine...
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Gathering; Collecting & Documenting GSP History...
1983 GSP#3083 Capt. C. Stallings #99 Post 41
1988 GSP#8292 Trpr R. Wilcox #799 Post 27; ACE wrecked in service with 24k miles; most documented & lowest mileage GSP
1990 GSP#0196 Trpr P. Kirkpatrick #756 Post 29
1992 GSP#2221 Trpr M. Prince #895 Post 9; “1 of 6” LoJack GSP Mustangs
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