Even if you find a roll, if it's from another batch it may not be an exact color match. I have a Tanzer Cabin wing in plain yellow that I had to do some repairs on and the roll I got at the LHS was the right color but doesnt match,real well. I have built a longer wing for it with flaps and have a roll to cover it with and I think it's a third version of the "right" color. Oh well.
Doc