As topic states, i bought this cupholder last year and it came from a seat leon. The cupholder fits where the heated rear window switch is. From what i could tell looking at the cup holder it is the correct size, however one end is curved to match the curve of the dash and the other end is at right angles, so two corners would have to be filed to match the gradient of the dash.
I was going to do this to my A3 but didn't think until i rushed into buying it that i only have one spare slot out of the four (as i have heated front seats and heated rear wind screen) and two adjacent slots are required.
I hope someone can take this off of my hands and get some joy with it, i'm still jamming my drinks bottles into the side compartment of the doorcard! If anyone is interest i'll get some pictures up. Cheers