Def, for the prototype parts mock up (pictured), we just took an off the shelf bolt and re-threaded it as a matter of convenience in our test fitting session for the Z parts. Thanks for paying attention to detail.
We will use grade 10.9 in production just like we have been using in Ryan Kado's formula D car.
The production bolt will also have plating - prototype photo bolt does not.
Please also notice the details that make this latest prototype rack spacer a really nice piece, like the radius that distributes the load from the sleeve to the main body, and the lip on the perimeter for retaining a dust boot.
Matej, of course the tie rod fits next to the bolt!

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