Check out this thread:
https://67-72chevytrucks.com/vboard/...d.php?t=643268
There's a chart in post #11 that lists the interior color codes. Yours is going to be the Medium Blue Poly that is listed as 13391 which is going to be different than the 506, but I'm not sure in what way. The top of your dash would be the Dark Blue 13398
If you look at:
https://paintref.com/cgi-bin/colorco...0Truck&rows=50
506 - Medium Blue is Ditzler 13363
If you have a shop that mixes PPG near you, I'm pretty sure they can get mixing formulas(From PPG) for most of these colors. Sometimes you can only get them in a Basecoat Clearcoat formula, usually DBC. Sometimes they can mix them in a single stage if that's what you want, but they don't have as many toners to tint the single stage as they have in BC/CC.
You are doing an incredible job documenting in your build thread. Thanks!
I'm going to pickup my 1967 K20 on 12/30 and can't wait. I also have another 1967 C10 that has fawn interior and I know that TCP Global can mix the colors and they can probably do the blue also. I've been waiting to go to my PPG store to get the fawn paint, because I don't have that truck at my place yet either.