Clio 172 cat converter OEM flange size / gasket size?

[itsdamo]

Hello,
I need to order a new flange gasket for the cat converter on my car.
can anyone advise whether it is a 2.5" or 2.25" flange / gasket as standard?

refer to lovely photos of what the previous owner did to my car in removing the mid section resonator... Dodgy welds.

 

[itsdamo]

Just to clarify, this is the gasket I need.

http://www.ebay.com.au/itm/RENAULT-...4579&clkid=3830471448746268540&_qi=RTM1582221

while I can buy from UK via EBay, I would like to know the size 2.25"or 2.5", to buy one locally and quickly from local exhaust shop.