How to attach front door striker

The front door would not open. Striker was loose. Tried to tighten, bottom screw would not stay. So with some kind of seemingly intelligent thought I decided to unscrew the top screw to see, I do not know, maybe what is behind it? I then heard a bolt or whatever keeps the striker in place fall down into the body between the front and back doors which is largely inaccessible (Argh! ). I pried off the plastic cover, and see that I could probably remove what seems like the seat belt tension-er (?) To access the area and retrieve the keeper(s) that have fallen. So, to keep the striker in place do the screws just screw into independent bolts or is there a custom part that holds both screws, and what would be the best way to secure the striker at this point? (Like just get a couple bolts and struggle to hold them in place in order to screw the screws)