This is the 'lower' Hard drive fan for the ML570. HP Compaq Spares P/N 161657-001.
4 HP Compaq Hot Plug axial system fans ML570 ML530 G2 122225-001 930586 CQ2
HP G2 DL380 Hot-Swap Server Fan 218382-001 from HP Compaq Proliant 6 Pin
HP Compaq Proliant DL380 G2 Hot-Swap Fan 218382-001
HP Compaq DL380 G3 G4 279036-001 Hot-plug fan assembly DL380G3 DL380G4
AJPARTS UK New Replacement For HP-Compaq HP 15-R219NA 15.6" Laptop Backlit Screen Slim LED LCD 1366×768 WXGA HD Display Razor 40 Pin Glossy Panel Non Touch
HP Compaq CPU Heatsink 445642-001. Ref00128
