Inspiron 7537 Missing Screw

On the bottom of my laptop, I'm missing a screw. I can't find any information on what size screw it is and I don't want to buy a pack of screws that claim they fit the laptop without knowing exactly what I'm missing.

If I'm using my laptop, It's the screw that is on the bottom in the top right hand corner. All the way at the top where the two halves come together.

The bottom isn't secure and it makes this clicking noise whenever I adjust the screen so I'd really appreciate some help.