Yea only MR2 and Supra brakes are interchangeable I believe, not saying they wont fit but it will deffo be hard work!! Plus I would go for the Turbo calipers if I was going to put Supra brakes on my car ;)
Hey mate pallet knows someone braking a Glanza with the rear discs so PM him ;) Dont get a GT axle they are slighty sorter and makes your wheels not stick out as far and looks pants