Help - Raceface Middle ring

[Liam]

I have Race Face 104 PCD Evolve 4 Bolt Ring Set and I need a new middle ring.

Can't figure out which is the right one though.

http://www.chainreactioncycles.com/Models.aspx?ModelID=4322

http://www.wiggle.co.uk/s/cycle/7/middle_ring

Any help much appreciated.

[Morgan]

32 tooth is the usual size on a triple chainset.

[Liam]

Cheers Morgan