Hey guys i'm a little confused about putting in my quarter glass, do i just slide the track in from the top and guide the pivot arm into its track that is inside the body and then attach the bottom bolt and the two top bolts, how do I get the Regulator to attach then, do i install from inside the car, I'm totally lost on that part, can someone please tell me what hardware im missing for the pivot arm bolt, sorry guys first time doing this