Picker, if you have alloys on the car, use alloys not a metal wheel as they are balanced differently, go on eBay / Gumtree / 1st Choice / Breakerlink / Vauxhall Breakers, all these sites are FOC, give then the year / make / Tyre / Wheel size, you will find these details on your cars tyres, take a bit of advice, do not go for used tyres from some places that sell cheap tyres / Wheels, these could be damaged Eg/ hitting Kerbs, bubble on the tyre wall, these can blow out at speed, if you see one on these sites, ask for an image to be taken & a Warrantee that the Wheel / Tyre is ok & a legal Thread, you should get a decent one with postage depending where you are for under £40.