We have just rebuilt our rudder on our 1965
Pearson Invicta. The only major seal is a standard stuffing box (for our
boat it is 1 1/2"). There is an O-ring where shaft passes thru the
cockpit sole but that is just for keeping rain
water out of the
bilge and most likely a standard size o0ring (we hope). Bearing wise stuffing box acts as upper bearing and
bronze shoe at bottom of
keel acts as the lower bearing. Not saying yours is the same design but thought I would post what we have since there both Pearsons from the same time frame.