When I tried to decode my fender tag, I found out that the code just means "blue", it wasn't specific. But I had several people tell me that my car was a B5-Blue interior.
I've been repainting all the interior metal on my 68 Dart. I just went to the local automotive paint supply store and got some B5 Blue basecoat mixed and put into spray cans, then I used a 2KClear called Spraymax thats also in a spraycan.
This works pretty well and I'm very happy with my results.
First pic is of my interior before I did anything to it, everything was blue, although there were several different shades of blue.
other pics are of some of the stuff I've repainted with the base/clear in spray cans.
One pic shows a piece thats been freshly painted, compaired to the door that hadn't been painted yet. dont know if the B5 is darker, or if the original paint was just faded that much.
Last pic is of one of the doors after new paint
Good luck !