E.mail the VX dealer on ebay your VIN and he will advise you.
http://www.ebay.co.uk/itm/New-Genuine-Vauxhall-Antara-Indicator-Stalk-With-Cruise-Control-Buttons-95462610-/370979748151?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item56601db937
http://www.ebay.co.uk/itm/New-Genuine-Vauxhall-Antara-Indicator-Stalk-With-Cruise-Control-Buttons-95462610-/370979748151?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item56601db937