Trying to figure this out: The FFR assembly directions for the door latches/strikers claim the re-use of OEM latches and fasteners. Then we are instructed to use the "supplied countersunk screws" to attach the door latch to the frame. Well, my Subaru saved screws are too short and I can't find any kit supplied countersunk screws. I also had to trim the latch mechanisms to fit into the door frames. Do I need to purchase some screws? Any ideas/experience?