Ally Maxwell.
I'm not Scottish, but I keep picking Scottish based keepers. As well as Rangers, my dad and older brother had a soft spot for Motherwell and, as a youngster, I was at the 1991 Scottish Cup Final between Motherwell and Dundee United.
During that game, Maxwell ended up with broken ribs, a ruptured spleen and double vision after a collision with an opponent. However he played on, even 30 minutes Extra Time, to help Motherwell win the cup 4-3. And made a great save late on.
He later went on to have spells at both Rangers and Dundee United, but I'll always remember him for those Cup Final heroics with Motherwell.