Rear knuckles cracked?

[EBinFL]

I was giving the car a once over after a recent track day and noticed what looks a little crack forming in both of the rear knuckles. Am I seeing this right- that both are cracked and need to be replaced? Or is this is normal/not dangerous and I just didn't really notice it in the past?

I'm a bit surprised it seems to be on both of the knuckles because this doesn't seem like something easy to do/break. I haven't had any insane curb strikes, offroad excursions, big pot holes, or anything like that.

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[itzTang]

It’s rubber. it’s a wear item

 

[Traxion]

That appears to be where the traction link connects right?

That is a bushing pushed inside the knuckle. Here are replacements: https://verklineusa.com/products/was-426

Should the outside of the bushing have a crack like that and it's possible a seam line? Not sure, someone else would need to go look at their car as I'm not near mine for a few hours to see if that's normal.

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