Are you sure you're not reading the last digit as a 3, rather than a 5? According to my sources, your P/N is correct except for that last digit.
I am also finishing up on doing a frame-off on my 70 GTO, what are your car's particulars - drivetrain, options, etc.? Good luck, Gary
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So many toys, so little time 
'06 GTO, '68 LeMans project, bikes, etc.
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