2x the price of the Z1 cover seems worth it for the GK one. Here in the US, it's more of a 3x price difference, and I couldn't justify swapping over.
The interior walls that the fluid sloshes against are closer to OEM, supposedly better for the diff, and it comes with 2 mounts. You can price in a separate diff brace to get a closer comparison, since that's closer to what the second mounting point is like.
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