I currently have the GKTech drift knuckles but I autocross, not drift. They're better than stock knuckles for me but the grip knuckles would be even better in my case. If you want the extra lock and adjusted ackerman, go drift knuckles, if you just want the fixed geometry, go grip knuckles.
Slider, I'd say you're fine having ground off a bit of the knuckle, those things are pretty beefy and 1-2mm isn't gonna change much.
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