I'm looking (on behalf of someone else) for a spare alloy for a\nVauxhall Astra DTi (2001) - unfortunately I don't see sizes, or don't\nunderstand, what's written on the existing tyres. Could someone assist\na complete idiot in finding a spare please? I don't wish to buy a set\nthough. Basically I need to know how to gather the information to\ngo find one. I have photos, details of what's written on existing\ntyres, uk reg certificate with all motor details on it.