Clark F

I've got 1st gen Ion 10's (I think/bought in spring '17), and the brake on one of the heels fails to deploy consistently (it stays up when no boot is in the binding). I'm guessing I would need a new heel plate to fix, is that correct? If so do you have availability? Also related - would new plate(s) work with my older generation model? And if they do, are they the part that theoretically solved the heel auto-rotation issue? Thanks!