While it may not be the easiest route or the exact answer you were looking for, you could always grab the revit models directly from Zurn and then export them to work in AutoCAD.
http://www.zurn.com/Pages/BIM3dCarriers.aspx
It's a pain in the butt but I'm having to do this right now since Fabrication doesn't seem to have the ZN- line of carriers.
Which zurn carriers are you needing? I've made the ones our company uses. I'll loan them out if you would like.
I am also look for the Z1203 if anyone has them to loan out? It would help me out. Thanks so much!