Duh, big oop's, what can I say? (I'm still sick ;D)
I was thinking CB360 again for some reason?
XS650 has WM 3 rear, (2.15", I just fitted some to my CB360 8) )
XS650 has WM2 front and WM3 rear
Should have said WM3 and WM4, you have correct sizes from Buchanans.
Tyre recommendations still stand though.
PJ