@ Hi, I’m looking to upgrade to a bigger set of brakes for my Mk3 Astra. Seemingly I can fit the 308mm vented discs and use Cavalier calipers but I can only seem to find 308mm discs in 4-stud plus the Calibra has the same calipers as the Cavalier. Can you tell me how I would go about doing this conversion please as my current brakes are useless. Also, how much will this cost and where is the best place to get the parts from. Thanks. Jack.