Changed mine 2 years ago
This is a floating bearing with the same at top and bottom
Steering went very stiff
Had to have boat lifted to remove rudder
The hardest part was to remove the retaining steel pin(needed lots of heat)
On examining the two balls there was no wear on the top one so put this at bottom and the new one at top
Well greased and all perfect full wheel spin left toright with little finger
Part from:- international-boat-spares.com
All shown on line
Would suggest try to loosen the retaining pin before lift out, lesstme in slings