is there a formula for this color that someone has? Id like to do a factory style resto on my 69 dart and first up is the underside. Thanks

Just a caution, A-bodies built at the Los Angeles plant had black primer underneath. Have example pics of three 68 Dart's with primo original undercarriages.

The E and B bodies may have been too.

Resto rick sells a paint in the correct color.

....my '69 Dart had light green primer.
i don't think this was the anti corrosion dip because it covered the whole engine bay.
no grey anywhere and it was a south carolina car.
al

What assembly plant? The color varied quite a bit by location.

If you can find a spot where it shows what your car had you should try & match it. That said....

Original samples that show the dip color(s) from three different 1969 Hamtramck cars;

...when i started the resto, the engine bay was brush painted black.
i stripped it to either primer or right to the bare metal in lots of spots.
your probably right but i didn't see any grey.
there was lots of grey and green on my duster though.
al