Need help on measurements for american alloys?

[NTSPARKE]

Hi is there any one who can help iv had my k1 a few month now and im after some alloys from america but i need some info to give to them so they can be made to fit a k1. I need the off set and any other info they will need. Whenever iv bought alloys before just told the place my car and they have got me the ones to fit. Therefore not that clued up on this particular area, any help would be appreciated

 

[DanGB]

http://www.seatcupra.net/forums/search.php?searchid=5019266

 

[NTSPARKE]

thanks mate big help there, plus i understand how the measurements work now. cheers mate