1060 uses 130 watt, 1070 150 watt, 1080 190 watt. Don't underestimate the heat and noise it can produce in a small case. Plus If you want to oc the card you should go for the biggest card (heatsink) your case can fit.
No, actually it's just an original gigabyte gtx 1060 6gb oc windforce heatsink with two NF A9x14 PWM fans and a Ek cable pwm fan adapter for gpu (SKU: 3831109869734). But considering that all the dual fan heatsinks are around the same size it should be pretty easy to swap the fans.