The paint and colors originally used came from Benjamin Moore and were an exterior latex paint. These colors have been discontinued however and are no longer available. For your convenience, the primary grey color and dark blue for the numbers were analyzed and converted to codes that may be obtained from any Home Depot.
The link below will open a PDF file containing the paint color codes. You may print this attachment and take it to any Home Depot location to have the paint mixed. The codes are for a gallon of each however the paint department can convert these codes and mix a quart or any quantity you require.