I have not seen your post yet and I do not know the rudder specs off hand. I will be visiting my boat within next 2 weeks, I can measure mine if you'd like. Just tell me what you need.
As far as the HIN it's been a while since I looked. if you give me a sample I could probably work it out for for you.
If our HIN looks something like (ABC000120181) it breaks down like this; (ABC/00012/01/81)
(So, hull # 12 and january of 1981)