No special Swedish mix. There are two or three major brands of automotive paint, and each offers several different kinds of paint, all of which can be mixed to match any color. If you order the paint by the color number, you will get paint that matches what your color originally looked like. If it has faded from 20 years exposure to the elements (not unlikely) it won't match what's on your car all that well. Most body shop suppliers now have a scanner that they can use to match any existing paint. You may get a better match that way.

Another issue to consider is what type of paint to get. Your gold metallic was originally two-stage paint, with a base coat and a clear coat. These can be tricky to match, even with two-stage paint. If you get single stage acrylic enamel, it will have a very different luster to it, even if the color is exact. All of this assumes that your car still has its original paint. If not, the scanner is the only way to go.

If you want to be really obsessive about it, and you are trying to match original paint, the best way to do it is to get another door with original paint of the same color at a junkyard. It will also be aged, and faded to match what you have now.

Another problem to watch out for with your color is crazing. This is a network of extremely fine spiderweb cracks in the clearcoat, which is more or less apparent under varying lighting conditions. If you have this, the only cure is to repaint the affected area.