There were some posts about replacing these a while back.My motor is a 1999 225hp ox66 and want to know where to get them and how to do it as I'm very mechanically inclined and dont mind doing it. It has some of the symptoms as described on the earlier posts like dieing at idle,sluggish when taking off but runs fine on topend.The o2 sensor was changed 2 years ago but have never changed the diaphrams. Seems like someone had posted iboats for the parts.