I just went through this trying to match the Bahama Blue (1968) interior of my 'vert. I ordered the TCP global stuff in acrylic urethane and it was too dark. SEM didn't have a good match so I ended up with Dupont's Spectra Master Vinyl Paint. It comes in an incredible selection of colors and is available in different glosses as well. Be forewarned, it is pricey, but covers well.
Where did you get the Dupont product you mentioned?
I'm going to face the same issue with my 69 Charger with a Green interior.
