Jockey Wheels?

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I have a SRAM X0 rear derailleur which needs some replacement jockey wheels. Getting various info online about going for originals or alternative makes. Anyone done this? It appears SRAM have changed the specs over the years, I think my derailleur is from 2006 but not sure.

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uncinqsix said:

These: http://www.wiggle.co.uk/bbb-bdp-rollerboys-jockey-...

Similar to OE, but with better bearings.

Yes I was looking at them, but will they fit my SRAM XO? It does not confirm in the specs.

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11 teeth on my wheels. Think I need the other version

http://www.wiggle.co.uk/bbb-bdp-05-rollerboys-sram...

out of stock though.

Any other options? £11 reasonable, £30 for SRAM originals is not!