It is recommended use 'mods' folder, this article explains how: http://openiv.com/?p=1132

This statues mod replaces elements in the game.

Bugs:
* Can't seen from a distance
* Some textures appear and disappear.
* Collisions only where original model was.

Installation:

Open your OpenIV, in edit mode.

"Optimus Prime"
Go to:
GTA V\Grand Theft Auto V\mods\x64l.rpf\levels\gta5\_cityw\koreatown_01\kt1_17.rpf\
Replace:
-kt1_17_01.ydr
-kt1_17_detail.ydr

"Ironman"
Go to:
GTA V\x64l.rpf\levels\gta5\_cityw\beverly_01\bh1_14.rpf\
Replace:
-bh1_14_build1.ydr
-bh1_14_detail_1.ydr