M-Tech commercialises these kits.......
#1
4-stud 306 x 28mm OPC Brake system
The kit comprises of a pair of 306 x 28mm vented front discs and a pair of modified GM V6 calipers and pads to suit 4 stud application. Note : Minimum wheel size for this kit is 16”.
Price : 795.00 €
#2
306x28mm 4-Stud Brake system now also available with drilled discs
This is the most powerful braking system for a 4 stud configuration on the market. Minimum wheel size is 16”. Set consists of following parts: 2 drilled brake discs 306mmx28mm (2mm thicker than OPC), 2 Astra G OPC calipers with special mounts, set of pagid brake pads. This set fits staright onto the following cars without modifications: Opel Corsa A, Opel Corsa B, Opel Tigra A, Opel Kadett E, Opel Astra F, Opel Vectra A (only 4 stud configuration), Opel Calibra (only 4 stud configuration), Opel Vectra B (only 4 stud configuration). For use on very powerful cars.
Price : 895.00 €