Sorry for the possible mistakes in description - my english is still very bad :)
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This small fix puts the barrel with piercings to the Whiterun stables, so now you can get it with active "Open Cities Skyrim". Just replace yours Piercing.esp with this one from mod.
THERE IS ONLY .ESP FILE INCLUDED IN THIS FIX, so you need to install the original Piercing mod first for all meshes.

Thanks goes to:
newermind43 for very nice "Piercing" mod (http://skyrim.nexusmods.com/mods/13469)
Arthmoor for "Open Cities Skyrim" (http://skyrim.nexusmods.com/mods/8058)