The chances of a good match from a purchase on line is slim. My suggestion is to go to a Sherwin-Williams Automotive branch (preferably) or any other Automotive Paint store with a portable color eye (spectrophotometer) to get a fingerprint of your paint color for a good match. The color eye is very similar to what a standard store or big box store that measures color for a match. That would be easiest and you should be able to get a quart made.