Exhaust clamp size??

[jec 0]

Hey, sorry if this is in the wrong section. I've got a K reg VR6 Golf (12V, not sure if that makes a difference), as far as I can tell its got a standard VW system all the way through. The joint between parts of the exhaust approximately under the rear passenger footwell has come loose as the clamp is buggered. Any idea how much an Exhaust place might charge to do this? Otherwise, what size clamp do I need?

Thanks!

jc