Prior to joining the group and learning about the kit I had the same issue with my passenger door. I purchased the inner door pull from Wild Bills. Not sure if Wild Bill's still has door pulls but it might be worth checking into.
Also on the latch mechanism there is a bolt that holds tension on the unit.Make sure that bolt is tight. you can see it after you take off the door panel.Mine came loose and wouldn't open the door either. Tighten it up real good.One more thing to look at.