Hobbywing has released FAN-2510SH-5V-10000RPM@5V-BLACK-B 86080050 under Cooling Fans Motor / ESC / Cooling Fan category
Using this type of fan mounted onto your ESC heatsink, then you will have probably the most cooling performance.
Specifications: Oil/Porous Bearing / Non-waterproof / ZH-2Y Male Plug / L=30MM
Applications: JUSTOCK , XSTOCK , QUICRUN-10BL60-SENSORED an such like.