This High Grade Rebuild Kit is used on a wide variety of years and models This kit fits Yamaha Showa Style Units as well as many others including Suzuki, Honda, Tohatsu. Showa is the manufacture of this hydraulic unit and that is why we call it a showa style unit. You will see that in the front of the unit it will say SHOWA on it. 2000-2018 Yamaha F115 F150 1997-2018 Yamaha HPDI 150 175 200 HP 1997-2018 Yamaha VMax HPDI 225 & 250 (VMax stands for Short shaft) this kit will not work on 225 and 250 Long shaft motors. 1997-2018 Yamaha 115 130 150 175 200 HP Carbureted 2 Stroke 1997-2018 Yamaha 150 200 OX66 This is the kit the professionals use Viton Seals have a working life of 20-30 Years in Salt Water. This material is the best you can buy on the market hands down but is very expensive and on average the cost is 15 times more than the regular Material. Our Company is Five Star Marine INC we are the only specialist in the world for Trim and Tilt Units and we rebuild over 3000 units every year from all over the world. When you buy a kit from us you are buying the best we may not always be the cheapest but when you hydraulics aren't leaking years down the road you will thank us for going above and beyond. If you cannot rebuild this unit you can send us the seal kit and unit and we will rebuild it for you. We will credit you the cost of the rebuild kit towards the Rebuild Service. All of our parts and Service come with a 2 Year Warranty.