Maybe
I just rebuilt my 98 380 and it seems to have cost me in the neighborhood of $180 and I installed a Wisco piston.. That price included piston, rings, wrist pin bearing and a gasket kit. This is the first time I have used something besides OEM parts to rebuild.. I had a 91 250 MXC previously.. Next time I will use OEM parts as the wisco stuff seemed to cause a carb glitch. or so it seemed.. I think the OEM parts will cost you in the neighborhood of $180 or so for a piston and rings, excluding the gaskets.. You can check the KTM site for dealers, for years I bought parts from a dealer 200 miles away.. :)