Try Mark at Marksman bearings http://www.bikebearings.co.uk/. He has all the bearings you need in bike specific kits.He does a full set of swinging arm bearing and seals, I bought the collars/sleeves from Yamaha, but got the rest here. Excellent to deal withhttp://shop.marksman-ind.com/fzr1000--fzs1000-fazer-linkage-bearing--seal-kit-10364-p.asp
Mine spends a lot of it's time on the back wheel as well, which doesn't help