I'm old and may not be understanding this post, but are you saying you have purchased two wiley windows. In one window the glass (clear pane) is fixed and cannot be opened and with the other the glass does open?
If this is the case, then something is wrong. The purpose of the wiley is so that it can be fairly easily closed, opened at an angle or completely open by removing the pane. The pane is normally held in place by triangular pieces on each side of the frame, cut at the same angle as the frame. To close, you just push the pane against the inside wall and slide in the triangles behind it. To have the angle open, you lean the pane back against the outer edge of the frame and insert the triangle between the pane and the wall. To fully open, you just slide the pane out of the frame. Some have gone so far as to add in "risers", so that the pane can be both opened at and angle and slid up some for even more ventilation.
If the pane is just permanently sealed then it isn't a wiley, it is just a non-opening window.
I have four wiley windows in mine. The frames are glued to the inner walls. Since mine was wood to wood, I used TB2 to mount the frame to the wall. They were also brad nailed in until the glue set. I then began layering 3 layers of epoxy around the frame and inside the wall and the inner wood frame. Everything was then coated with 5 layers of spar varnish. I have weird exterior shapes for mine, which is one of the beauties of the wiley design. It can look like anything from the outside, but is a rectangle with and angle on the inside. With mine, now over 2,800 miles of travel and the entire summer uncovered in the daily Florida rain storms, they have never leaked a drop. I leave at least two angle-open at all times for ventilation. If you are doing fiberglass window to a wood wall, you can use epoxy to mount.
In this one the window is angled open. I don't have the triangles in place as I was just shooting these shots during construction

Window closed. Once again, the triangles aren't installed, but you can see where they go on the frame sides.

The ones on my doors are slightly different and instead of side rails they each have a cross bar, but they still use the slide down triangles. I made these this way so that my 12v O2 fans can slide into them if I want and they hold a couple of little cut outs my wife made, the "Conch Fritter's Conch)

dave