Flashforge creator Fan Bracket thing

I wanted to use this Fan Duct, http://www.thingiverse.com/thing:295317, on my qidi printer which is a flashforge creator clone which is a markerbot replicator dual clone.

In order to use that Fan Duct I needed super long M4 screws which I do not have and do not want to wait 3 weeks to be delivered. I wanted to modify the duct but I was having no luck playing the import export game with multiple CAD software to get the model into sketchup.

Then I stumbled onto this, https://www.thingiverse.