A verry simple model edit

[Hashjie]

I need the following standard wc3 rocks to have a plane on the bottom of the rock so that I can change the pitch angle without having to look to a transparent rock >.<! You can use the same standard texture for the rock.

Rock Spires (Outland)

and

Ice: Glacier


(These names are from Ultimate Terraining Map, I forgot the normal names)

+rep for the person who can do this simple task, I can't seem to get it to work myself -,-...