I need to replace mine on my boat.
Most of them are now completely saturated because of my little sinking issue last summer.
One survived by being on a raised deck with a pedestal. So I too am looking for a set of 4 but may wait until next year as I just dropped a grand on a hydraulic steering system to replace my cable steering. The cable filled with water and froze so I don't know if it was still going to be usable so made the decision to upgrade. If the old one is usable I will install it on my friends boat or on another boat I own.