They are a bit difficult to install - as the old ones weren't there to help me. Found it out though - The holes in the window frame didn't match - Decided to drill the flange on the regulator to match the holes in the boat's window frame and it worked perfectly - so when they didn't work - there weren't any extra holes in the window frame. I will upload some photos for you so you can see if this is the part you are looking for as the pictures on the site are not very informative.
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