Hello .. Thanks for having me
I am trying to help a friend w/his 1977 GMC Suburban project. I need your help in identifying the original truck color/s from its invoice. The glove box sticker is missing.
A copy of the invoice is here : https://limewire.com/d/bJPFs#TuT4fQ1C5O
Appreciate your help Cheers

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You have ZY3 Special Two Tone paint and the main color 86L is Midnight Black, while the secondary color is unidentifiable from the invoice, as it could be Lite Blue, Buckskin, Santa Fe Tan, or Frost White. I would guess it to be Frost White. You'll have to do some paint scraping on the sides to be sure.
71W is Red Custom Vinyl Bench seat based on pickup Service Parts labels
71I is probably just "red interior".
Maybe you have this already but the GM Heritage site has excerpts from the Dealer Data books of some degree for your suburban https://www.gm.com/content/dam/company/no_search/heritage-archive-docs/vehicle-information-kits/chevrolet/1977-Chevrolet-Suburban.pdf
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