These are three little fan mounts for mounting 40mm fans on Raspberry Pis.

DEICEDfanMOUNTnoP1565-STL0.stl : this is just a little mount to put a fan above some little stick on heatsinks (or nothing, whatever).

P165a40MMfanMOUNT is for putting a 40mmfan on a Geekworm P165a (7mm) heatsink. Which is actually a pretty legit cooling method by my tests. Not Ice Tower Cooler good. But close and much more low profile.

P165b40MMfanMOUNT is for putting a 40mm fan on a Geekworm P165b (11mm) heatsink. Which is also a pretty good cooling method.

They attach with m2.5 scews and maybe nuts (bracket to Pi or to heatsink) and m3 (10mm

m2.5 x 6mm screws (and maybe nuts, depending on configuration) to attach the brackets to the Pi or to the heatsink.

m3 x 10mm - 12mm screws for attaching fan to heatsink - depending on fan used.