Product review (1 stars): Same broken design as the original
As others have mentioned, this part is identical to the original, which has a design flaw that causes it to crack fairly quickly (usually within one to two years; there are lots of on-line reports of this, and even a petition for recall on change.com).  Reviewer "Pug Luver" mentioned her workaround, which hopefully works well, although I worry that in the long term a washer may not fully prevent further cracking.

LG actually has a very similar knob for other ranges (AEZ72909002) that is better designed, but they sabotaged the ability to use it as a replacement for the LRG 30355/30357 series by reversing the D-shaped connection hole.

If you're stuck with this gas range (which likely means you'll run into the broken knob issue), my advice is to try the product from the LGknob web site.

Needless to say, I'm telling anyone mentioning the need for a new cooking range to stay away from LG.