Trying to find Model of Stairs in Model Viewer

[DEATH eVADER]

At the moment I am started out my level. Got most of it sorted out, however I am trying to get floor transition included. Unfortuantely I haven't been able to find the Industrial-Style Stairs that was prominant in the Nova Prospekt and the mod Minerva (the first level).

Does anybody know which folder it is in, because I am having problems finding it.