Wossner piston kits have a great reputation. I needed a kit for my '01 XC 200 and someone on this forum recommended Niks Industries for Wossner pistons.
Not only did Niks have the lowest retail price that I could find, but just by pure luck, had a 40% off for onlne sales the weekend that I did my search.
Great price, top of the line product and fast, free shipping. Niks Industries is worth checking out,imo.
Also, there should be a letter, (A,B or C) stamped in your cylinder near the carb. You'll need that info when ordering your piston kit.
It's not what you asked for, but it worked out well for me, so I'm passing it along.
RB