It’s along time since I did that article for the mag.
But I did use Kawasaki 71mm rings and they are identical (Japanese make) Top/Middle rings are fine except the oil control
spring which is wider. So as my springs were fine I refitted the springs and then fitted the new oil control
rings. If you wanted to use the new springs you would have to machine the piston oil groove out.
My engine had already been bored out by 1mm but I’m sure you will be able to get the std 70mm rings
if you look around. The wisco kit is 72mm and you also have to use their head gasket.
It must have been 5-6 years ago I did the work and the oil consumption is still very good.
Hope this helps. Cheers Gary.
PS one firm that helped me big time with my cb250k rings was Steve at piston/broke