Steve
Had exactly the same issue last week. There are another couple of boxes where if you don't know the code you put the make, model, year of manufacture and description of the colour, turns out mine is MO25, but if there were a couple of similar colours produced in that year you might be better giving them a ring to make sure.
My last car was signal red but a 2004 car and I haven't seen that on a sport so yours may be another colour.
