greetings.i finally got 2 ram power tilt and trim unit to install on my merc 850.it came off 1969 merc 800.i want to replace rubber Orings on both cylinders.i am stuck with O-ring dimentions.i went to local hydraulic and fluid shop with numbers from genuie mercury manual.guy said that some of them are phisicly impossible.why would those Orings not match.is mercruser.com site correct with the sizes of Orings?does anyone know how much of lift in psi will it produce?tnx
