I fitted a dension lead to my
Mk2 Leon today. I was going to remove the glovebox but managed to install it without the hassle of taking the glovebox out. Don't know if it is the same on a Toledo, but there was small panel in the top of the glovebox that is scored around for easy removal - a bit like a cable entry point on the back box of an electrical socket. If you remove this, you can fish the Dension cable through to the rear of the head unit without too much trouble.
Hope that this helps