Delphi BG4199C Brake Disc Set. For Vauxhall Astra J, Mokka / Mokka X. Delphi 268mm Rear Brake Disc Set. For Vauxhall Astra J GTC, Astra J MK6. Autovaux was established in 2001 and is recognised as The Number 1 Supplier for Genuine Vauxhall spares and O.E Quality parts for all car manufacturers with Vauxhall trained staff and the most up to date parts software available.