76 K20 glove box codes

[71LongbedC20]

Hi everyone, I am working on a 1976 K20 and I came across my glove box codes and found an old CB radio certification sticker on the inside roof of the cab. Here is a picture of the glove box sticker. I threw in a pic of the Radio certification and a few of the truck in almost current condition. Basically my question is about Option code ZY3-Special 2 tone paint and 12L-12 FROST WHITE 43 WI and would like to see what this looks like. I did a search and did not find any "white frost special 2 tone" and found on a forum somewhere that the 12L code means Secondary color, exterior, silver met (91). Any help will be greatly appreciated, Thanks