2012 Gas Gas EC300 Checkpoint Off-Road CNC Impeller
 

I made a video showing it on the bike.
https://youtu.be/P6CvWpXzAiM

Side by Side with OEM plastic one
https://youtu.be/ltH40eGnsDE

Checkpoint Off-Road:
http://www.checkpointoff-road.com/store.html
PART NO. 5003

Using a Matto Cycle gasket too (he has them made thicker)
www.mattocycle.com

I use one of these with no issues. I did have to make up a much thicker gasket. Buy an extra gasket to stack if needed.