Sloped Glazing mullions not loaded?

[mranger]

Followed this tutorial to create a flat trellis over a bar restaurant, but I'm stumped when it comes to step 5, selecting mullion sizes - I have none! Do I need to load mullion families or something? thanks all!

Here's the tutorial:
http://overrevit.blogspot.com/2010/07/creating-quick-trellis-in-revit-using.html

Here's my dialogue box:
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