You will need a seal kit as well. The Athena kit is a gasket kit (as it says). It has no seals except the valve guide ones. It does have the engine o-rings (except for the valve cover ones, but your model uses gaskets there). If you haven't done so, you will also want to replace the rubber/metal washers on the outside four acorn nuts on top of the head. Mike's sells brass replacements or you can use copper ones from the big GS Suzuki fours.