I baught an a3 glovebox from the scrappy. Basically I had to cut the guts out of it and did the same to the leon one. In effect, you are using the fascia of the leon glovebox and the internal stuff from the a3 one. You could just bolt the a3 one into your leon if you have a grey interior, but mine is black!
Will try and get a pic or 2 sorted out