centre cap size

[cdti]

just wondering what the size of the centre cap is on these wheels?

http://img300.imageshack.us/img300/9849/dee81va8.jpg (http://imageshack.us)
http://img300.imageshack.us/img300/9849/dee81va8.739e04f100.jpg (http://g.imageshack.us/g.php?h=300&i=dee81va8.jpg)

cheers guys!

[olds_kool]

internal diameter is about 56mm external 60mm

[cdti]

so what size vw centre caps would i need?

[cdti]

so what size vw centre caps would i need?

???