You might think of doing what I ended up doing. I purchased a pair of American Models SD 60s that had been dropped and badly damaged. I did the repairs and reconstructed both ends of the engines. I purchased three paints from different manufacturers that supposedly matched the UP yellow but none of them did. At the suggestion of Ed from Gold in Hands l went to the Home Depot store and had them match the color, it was spot on, perfect. I then purchased one of the paint sample jars of the color, which is a latex but, with very careful application it is very difficult to see where the repair was done.
Ray