High alt plugs, can these be DIY'd? I was riding at 5,000+ foot altitudes last week in Colorado, really could've used one. Practically zip acceleration above 55mph. My first two new K75's came with the OEM plug in the tool kit, but not with the latest one I own. Can't find one online and local dealer quoted at $30-40 for new OEM and a long ship date from Germany. Never need one 90% of the time, but (again) nice to have in the mountain regions. Thanks.