These have been tested and assembled on a genuine window regulator. Using genuine parts and also upgrading to aluminum pipe pole to combat heavy resistance in the up position. Anti Fray Loom to keep cables from premature failure from open and close sealing. These are super tight and to spec by genuine standards not aftermarket. Meaning spec parts out last aftermarket kits. Help line and video link available for install. Message me before repair and be ready to tackle because it's a tough job. Comes with Mopar Grease, apply grease at the end. Rubber hammer needed to lightly tap Genuine ends to rails, same company just different time era ends.