Wheel Bearing Containing ABS Ring

[pennywise]

Hi,

I have a 2006/07 Seat Leon FR TDI 1968cc, Registration Plate: 56

My engine code/engine number is: BMN

I would like to buy a Wheel Bearing Containing ABS Ring for the Rear-Driver's side.

I'm not sure how many sizes these come in but I've seen both 30mm and 32mm, does anyone know which one I'll need or how to find out?

Thank you