I second AllExtinct, Samco hoses are nuke proof. Grimmspeed makes some nice hoses too but they are black not red. If you stick to reinforced silicone you will pretty safe across the board.
Don't quote me on it but Im pretty sure Subaru uses 6x15mm with a 10mm hex top anywhere the interior plastic meets metal clips. At least for the head unit and dash they are rough cut self tapping screws.
13 WRX Hatch - Torqued Performance Stage 1+
Slow is Smooth > Smooth is Fast