On website (Stealthchanger.com), Top hat build guide, extrusion top hat.
Step 15 of 18. Description currently says "Install each of the hinges using 5 M3x12 SHCS screws in the vertical extrusion and a M3x8 SHCS screw in the lower horizontal extrusion."
There are only 4 M3x12 screw in the vertical extrusions.
https://stealthchanger.com/hardware/guides/tophats/2_extrusion/?step=15