SeaStar HA5418 Back Mount Kit for SeaStar Standard Helms Used to retrofit a new SeaStar standard helm in the old 4.5 diameter hole Reduce the helm protrusion from the dash by the thickness of the dash Retrofit new SeaStar standard helm into old cutouts for mechanical and hydraulic steering STEERING MANUFACTURER HELM MODEL TYPE SYSTEM BACKPLATE KIT REQUIRED SeaStar SAFE-T MECHANICAL YES BIG-T MECHANICAL YES ROTARY MECHANICAL NO RACK PINION MECHANICAL NO SYTEN HYDRAULIC YES MORSE ROTARY MECHANICA