WR450 lower chain tensioner

Can anyone tell me what size roller I need for the lower chain tensioner on a 2003 WR450. Mine has fallen off so don't know what size was fitted. Local bike shop has a 32 or 42mm diameter, but none of their catalogues give this info.

42mm is the one. It takes 608-RS bearings, IIRC.

42mm is the one. It takes 608-RS bearings, IIRC.

Cheers, thanks for the info, much appreciated.

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