sunroof adjustment '82 733i...(?)

When closed, the right side of my sunroof sliding panel is about 1/4" to 3/8" lower that the left side making me think my water problem may be from the top. One of the books I have says to "unclip" the sunroof frame and then do the adjustment but the actual frame does not look like the book diagram.

And advice will be greatly appreciated.
733i-105k actual miles Seattle

(I just found this board today and already I found info on clearing out drains that will absolutely help me! Thank you!)