Thanks to all for your interesting and creative suggestions.
Color matching is indeed one of the most challenging parts of this endeavor.
I have already tried a number of different markers in trying to match the color, all to no avail.
I have sent an email off to Mr. Whitewall, being they are the ones that do these orange sidewalls for Morgan, my hope is that they will respond in the positive; we shall see.
I will post results when they are available.