The stock head gasket  goes from stock 67 mm to 69 mm.You dont have to find and special one for it.The ome is the one you need.It already accepts the 69.mm bore.Mine is bored 69mm with stock gasket.They over size them to finally bore from the factory.But if you go to a big bore  you would have to have a different gasket but that is when you put a bigger sleeve in the jug. The lt250r is not like the Yamaha blaster and you don't  have to size up the head gasket to the size of the bore.Are you sure it 69mm.I just bored mine and the gasket fit just fine with no overlay.