Anycubic I3 Mega MKS Mosfet Holder. You will need four M3x8 screws.
Also check my I3 Mega ULTIMATE upgrade guide! There is a lot of knowledge which may help You get the best results. You will find it here: http://bit.ly/2OVbu5Z
Mosfet which I'm using:
Mosfet_holder.stl | 8.1MB |