SilentCGS

This one might be a little bit different but perhaps you guys can help me. I downloaded the Sovngarde Steel Armour (link : http://skyrim.nexusmods.com/mods/16096/?tab=2&navtag=%2Fajax%2Fmodfiles%2F%3Fid%3D16096&pUp=1 ) and now i want to replace the vanilla steel armour with this one. I don´t want a new set, just replacing the vanilla one. How can I do this ? I´m new to Skyrim Modding, so please be kind. :D