I wouldn't get that. The reason there is an extra fan that stick out from the heatsink is to cool the endbell on a brushed motor.
If you want two fans, its better to get two of these:
http://cgi.ebay.com/Yeah-Racing-YA-0...QQcmdZViewItem
That way, more heat is drawn from the motor into the heatsinks, which are then cooled.
BL Revo: CF G2R, LMT1940/7, 6S FP 30C Lipos, MMM, Hitec 5955TG
CRT .5: 7075 Ext Chassis, LMT1930/7, FP 25C 3S Lipos, MM