I have a very well used 038 super, that runs good since i rebuilt carb and replaced fuel line. I have it torn down right now as I had no way of being sure what model it was. Measured the piston and it's 50mm. Just ordered a set of caber rings for it. Someone more skilled than i would probly have ordered a piston as well, but I'm batting around .500 with replacing stihl circlips, so I was just gonna do rings. Cylinder looks pretty good to me, but I would not call the saw "nice" as its fairly well used. Having trouble loading pics, but if you send me ur email I can forward an email with pics to you. I think i could sell it on the local craiglist for 250 once i put it back together