Classic Mustang interiors were never painted with exterior body colors. The compete interior is painted with the interior color. Since you are doing a fastback you might want to stay away from spray cans. They will work but you will need a lot of cans. The fiberglass back pieces are painted just like the doors, dash and column.
Call NPD, and get part # VP-4464. It's SEM black interior charcoal metallic spray paint, it's what you want and works well.
[/SIGPIC]67 Fastback GT -- original colour (Frost Turquoise), orig engine. Pic is of me and the Mustang taken in summer of '67, with original F70-14 Wide Ovals. Same car is now restored to "as new" but 3 speed tranny swapped out for 4 gear, with tach dash, original Equalock rear, Opentracker UCA, LCA, roller perches and idler arm, with roller bearing pedal cluster, Cibie headlights, 4100 carb (old 4300 put in storage probably forever)
You can also find it in PPG DDL Acrylic Lacquer named Charcoal Poly it has a slight metallic content to it and it sprays out real nice over a light coat of black Epoxy primer. Here is the OEM code but my sticker has faded 446441 so forgive me if the last digit is incorrect.
The black metallic interior paint is available from PPG in a lacquer which may or may not be available to you locally due to environmental concerns. I had my painter use SEM trim black as the base coat with a couple of light coats of the lacquer when I did mine a number of years ago. The inner door skins were media blasted to remove the old layers of paint to bring back the stamped texture which adds a crisp look to the panels.
*67 Vintage Burgundy 390GTA with most of the bells and whistles*
The designers of the interior new what they were doing with the contrasting blacks, it looks good. To me all one color just looks odd, but to each their own. I'm still able to get it at select PPG locations here in Ga.