This kit fits all Yamaha V6 2 Stroke and 4 Stroke Motors (HPDI OX66 225 250 300) (Four Stroke F200 F225 F250 F300) Does Not Fit Yamaha 200-250 with short shaft All the rods seals in this kit are made out of Viton a very expensive super material formulated by Dupont and will resist everything from ethanal to UV's to Oxidation from salt water environments. We do not offer returns for seal kits please be sure you are ordering the correct kit before placing you're order. If for some reason you cannot build the unit, we offer a rebuild service and we will credit you the amount for the rebuild kit towards the rebuild service of $470. All of our rebuild services come with a 2 Year Warranty. For our rebuild services please send your unit to Five Star Marine At 6902 Industrial Ave, Port Richey, FL 34668 61A-43822-00-00 61A-4389H-00-00 93106-19N50-00