1958 Bonneville Convt Trim Tag Decode help

[58BonniVert]

My father is getting ready to sell his '58 Bonneville convertible. He purchased it in 2016 at Auburn, IN and it has been his parade/putt around car the last eight years.

Trying to decode the trim tag, I believe I have resolved everything except code "GK" and cannot find anything. HELP!

Style 58-2567SD
Trim 289-2 = Red & Ivory interior with black top
Paint HHY = Ragoon Red / Graystone White

ACC =
GK ???
BA Basic Group
EX Electric Antenna
N Air Conditioning
PX Tri-Power Carbs

Appreciate any help! Thank You!
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[Larry]

You might try contacting Mike Noun at Pontiac Window Sticker Reproductions https://pontiacwindowstickers.com/pontiac-window-stickers-by-mike-noun/

His web site says from 1959, but he is a wealth of information and perhaps has what you might need. It's worth a try.

I do not believe Pontiac Historical Services (PHS) goes back that far yet, but it wouldn't hurt to ask them too.

[58BonniVert]

I will contact both.

The websites state 1959 and newer.
So 1958 might just be a black hole model year.