Looking though Captiva stuff on ebay, came across these- a good deal if you need them!
http://www.ebay.co.uk/itm/GENUINE-VAUXHALL-ANTARA-CHEVROLET-CAPTIVA-SKID-PLATE-/260826323171?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3cba75d8e3
New Skid plates, f+r, £80 or offers
Iain
http://www.ebay.co.uk/itm/GENUINE-VAUXHALL-ANTARA-CHEVROLET-CAPTIVA-SKID-PLATE-/260826323171?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3cba75d8e3
New Skid plates, f+r, £80 or offers
Iain