There is no difference between Port & Starboard lower rudder castings or rudder blades. Only the upper castings are "handed".
There is a difference between the "Old Style" and "New Style" rudder system for the H18. Around 1987, the entire rudder system for the H18 was revamped which included changing the upper and lower rudder castings. The old style and new style rudder castings are not interchangeable (i.e., you can not use an old upper casting with a new lower casting or vice versa).
The old style lower castings had an aluminum "latch" that engaged a rolling pin on the upper casting when the rudders were locked down. The new style lower castings have a rotating plastic "cam" that engages an adjustable plate in the upper casting when the rudders are locked down.
Probably the easiest way to tell the two systems apart is by looking at the the upper casting. If you see a recessed slot in the top of the upper casting with the head of a hex bolt showing (5/16" bolt), then you have the new system (this is the rake adjustment for the rudders). If there is no hex bolt in the upper casting, then you have the old style system (no rake adjustment). It can be hard to tell the two systems apart by looking at the lower castings as they look very similar.
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