Replacement cylinders for single engines up to 300hp and dual nonpower assisted outboard systems up to 600hp. All cylinders allow independent trim and tilt. HC5345 is the most common of the front-mount pivoting outboard cylinders for SeaStar and SeaStar Pro steering systems. HC5342 Slide Plate Cylinder fits Johnson/Evinrude 250-300hp V8 from 1988-1997.