Recently I bought a 2003 350z however the previous owner had no struts on the trunk nor the brackets/hardware that is used to mount the struts. So I purchased a set of aftermarket struts that came with the bracket needed to mount the bottom of the strut into the body of the car. The problem is that it came with no screws and I am not sure what type of screws to use.

My local Nissan dealership was no help either as they want $25 for the bracket and screws (sold together).

Does anyone know what type of screw to use for this bracket?

Here's a link to the bracket being sold online for reference:

 

Just spend the 25 bucks and be done

 

Another option would be to buy the upgraded ones from Z1 that comes with everything plus instructions. They last longer.
I have them for years now with my mismo spoiler in cold Minnesota. Still as strong as day one

 

I second the Z1 hatch struts as well. Bought them years ago and they are still nice and strong. A little warning though. It will take a little more effort to close, but I guess that's better than having none at all.

 

Although, I am a very frugal with my money, I do agree with this. . .
Sometimes your time and aggravation is not worth trying to save $15