These heads are for a 1998 700 RMK that I sold years ago with the stock heads. I rode these heads above 7000 feet only and they worked great. They will work down to 6000. I have several new o-ring base gaskets, one new water intake gasket, but only the one set of top o-rings on the heads but they look perfect. All the hardware is there. The aluminum washers are slightly dished but still worked fine. $90 plus shipping. littlegrandhome@yahoo.com