FX chassis screw sizes, not just short and long. Small, medium, and large.

Hey, first post here and I'm already asking for help. I just took apart my P6831-FX to reseat the GPU with Diamond IC (followed the guide) and now I'm trying to put it all back together. Unfortunately, I've forgotten what exact screws go where, and the stickied teardown thread is no help at all. It only mentions two screw sizes, short and long. There are (at least) three screw sizes on these FX laptops. Short (tiny) screws, medium screws, and long screws. To make matters even MORE complicated, some medium and tiny screws have thin heads while others have thicker, rounded ones.

I used four medium screws (with thin heads) to mount the GPU's heatsink assembly and now I'm remounting the mobo to the main plastic chassis and I'm wondering which screws to use. I actually got all the way to remounting the speakers and realized I wouldn't have enough of the medium screws to fill in all the holes previously occupied by "short" screws, as mentioned in the pinned topic.

Can someone PLEASE clarify the pinned topic? It's kinda misleading. Sometimes the screws it mentions as short are tiny, then sometimes they're medium. Other times the screws called "long" are medium, too.

 

Here's an image to illustrate the problem.

Can someone please help? I'm sure someone here has also taken their lappy apart before and remembers.