The basic trim level for the Grand Prix was called "Model J";
the "SJ" trim designation was for "Sports J",
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Here's the code for the Golden Mask!
Golden Mask: @qyp sj@- n-j% Th6= 4-sk 32cr
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Pontiac Grand Prix's from the 60's and 70's had J SJ SSJ LJ. J
was the standard model. SJ was a bit sportier, Sport J but options
were available on a J model SSJ, Very Rare. Specialty GP's Limited
production. LJ showed up in the 73 model, Luxury J