Thanks Jason, haha I agree, nothing like the boat smacking you in the head for trying to put it away for the winter.
I don't see a part number on them sorry, they are the ones that came with the boat. They measure 20" fully open, and 12" closed. They might be 40 lb struts. How I have them set they do not close all the way. Might be lucky and find something close to the same size out of a scrap yard?
I also used bolts and t-nuts on the sun pad to hold the bracket, the original #10 screws pulled out. Beefier the better I always say!