I got the Astra disks off ebay, about £65 I think make sure they look like the pic above Spacers I had machined up from the same place that machined the discs, make sure you clean up your hubs and get a correct measurement I believe it is 55mm for Glanzas but not completely sure. I took my car to the place and they measured the hub to be safe too. They did need some boring with a dremel to fit flush though, bit of a pain but hey! Celica pads were from a local parts shop, only £20 or so. Just make sure they don't give you the ST165/early ST185 pads. There's a separate set of pads for the late spec. I can't remember the switchover date between the models but there's a GT4 brake guide if you search on google and it says think it was from a Celica forum or something