Being a repaint there is NO way to know what this color is, it could be Ford Chevy or Amana, there were no Yellows in 68 on the Chryslers, In 67 there was.
The names for the color may be different between Dodge/Plymouth/Chrysler each year but the colors are the same per code.
67 SS1 - Cream/Soft Yellow/Ivory (this color is more yellow than tan)
67 RR1 - Yellow/Yellow/Daffodil Yellow
68 SS1 - Yellow/Sunfire Yellow/(not listed for chrysler)
69 Y2 - Yellow/Sunfire Yellow/(not listed for chrysler)
69 Y3 - Cream/Yellow Gold/Antique Ivory / (Champagne Imperial)
The auto paint suppliers have a gun that can read the paint and pic a color from the database, a color this old may not show up.
A misconception on these guns is that they can match custom colors and make the formula, they are not that smart.
So either pick an original color based on seeing different cars, see if they can detect this color, or just go pick a new color.
Alan