I have a doubt!
I always heard that you shoudn't just use spacers on a single axe. Since that would change the suspension overall lay-out and at the same time especially if it wasn't the traction axle and if it would make it bigger than the traction axle on a FWD car.
The Leon has 1527mm at the front and 1508mm at the back. Those 19cm of difference allow to a being used a spacer between 10-15mm just at the back without making the rear axle bigger than the front. (As far as i know when such situation happens the back tends to break traction more easily...)
But then, just adding spacers at the back, won't it be a pita to keep the 4 wheel alignment inside specs?