Power Steering Pulley Bearing Size?

[meddy]

Does anybody know the size of the bearing in the power steering pump pulley please? Mines squealing when cold so Im guessing it could do with replacing. I can whip it off and check, but life would be easier if I can avoid disabling the car.
 
Thanks...

[meddy]

Ok for completeness if anybody does a search. The idler pulley bearing fitted (Just noticed the mistake in the thread title and my original post. :mad:) is a NSK 6303DU2. However I have no idea what the nomenclature means. A DU is a single contact seal unit but there are clearly 2 seals fitted which means it should be a DDU so there you go. :3Confused Tomorrows job at work is to get hold of a new unit and press it in.