If you look at the table on this page http://www.diagnostics.org.uk/2010/01/t ... ng-system/ you can see all the different combinations of button module.

In simple terms, just because you swap a blank for a button with a label, the car has no way of knowing what button it is, as it is not always a sport button in that position. I would pass on that auction and get the right thing from the start.