Any auto parts store where they sell real autobody supply's - can mix paint for any color car ever made. They are pricey - like $20 a can, but it is real auto paint.
Gold Glow was a special color only offered for 2 years, '72 & '73. It had a tint of green in it. Most paint companies have slightly changed their formulas over the years. When I went to paint my '73 Stang with Dupont, the formulation came out more gold that gold with green in it. It was actually a prettier color and very close to original, but not perfect. I doubt you will be able to get a spray can mixed to the exact original formulation. Just my opinion. I love the color and think it looks outstanding on our Fords. I am always getting positive comments on the color. You can see what it looks like on a Stang if you go to my images. Jim