[url=https://wiki.multitheftauto.com/wiki/SetElementDoubleSided]https://wiki.multitheftauto.com/wiki/Set ... oubleSided[/url]
[url=https://wiki.multitheftauto.com/wiki/SetElementInterior]https://wiki.multitheftauto.com/wiki/SetElementInterior[/url]
--do like :
setElementInterior ( objectName, 1)
setElementDoubleSided ( objectName, true )