Hi Stegger
I've started last season with SX2 with stock plastic holders. Ran it in the front with your brace - that held just fine. I broke in about 3-4 races 2 rear blocks but it was bad landing really. If you want to be on safe side - alloy holders are way to go. You can still run plastic ones but have pack or two of spare and run your brace in front and it's doable just fine
