Chris,
Great car you have there, is it a recent acquisition? I ask that because it's always a good idea to get the Body & Chassis Parts Manuals for it, along with with the Shop Manual.
All the trim codes from your data plate should be found the Body or Chassis books (or both). Unless someone with a '54 Pontiac reads this and helps you out, I'd recommend getting the manuals; eventually you'll need them anyway, and then you'll have most everything you need right at your fingertips.
Regards,
TG
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Luck is when Preparation meets Opportunity.