Trek Remedy 7 Headset Bearing

Can anybody point me in the right direction of the 1.5" 36 x 45 cartridge bearing that I need to replace in the bottom of my E2 headset.
The Double X one that I bought from chain reaction is the wrong one!
I can't find anywhere online that sells it, and I can't see the part no. as it's worn off the original.
Cheers
The Double X one that I bought from chain reaction is the wrong one!
I can't find anywhere online that sells it, and I can't see the part no. as it's worn off the original.
Cheers
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Parktools :?:SheldonBrown