i bought a kit from lmf 308mm discs, pads, calipers and bracket for 375. they were the groved red dot ones. and im sure that they fit the 5 stud without grinding the hub down but im not sure about that.
I Have Brand New Saab Aero/viggen Calipers And Their Carriers (the Calipers Are The Same As The Vauxhall Ones But The Carriers Are Different) I Got Them On Ebay For £40!, The Thing Is The Carriers Are Aluminum As Saab Used Alloy Hubs From 2002 Onwards. If I Can't Get Carriers For A Decent Price I Will Have A Local Engineering Shop Adapt The Saab Ones To Fit The Vauxhall Hubs. Its Worth Checking Ebay For Saab Parts If Any Of You Guys Are Considering Doing The Conversion As I Picked Up 308mm Saab Viggen Discs For £55 Aswell. Hopefully I Should Get The Complete Conversion Done For Under £200. The Following Saab Models Are Worth Searching Ebay For..
Saab 9-3 Viggen 99-03 308mm Discs
Saab 9-5 Aero 99-02 308mm Discs/ Same Calipers As 308mm Gsi Vectra
Saab 9-5 Aero 02-06. 314mm Discs/ Same Calipers As 308mm Gsi Vectra.
Now According To Saab The Calipers Are The Same On The 308mm And The 314mm Models Its Only The Brake Pads Are Different. Worth Looking Out For 314mm Discs For Even Better Bracking Power