944 sway bar width

[Hoghead]

I see how they mount to the spring plates and thought that this would be the case, but I need to make sure before I import it.
In my case I need to mount to the Eagle Performance coil-over bracket as there are no spring plates

Stock looks like 19mm and I think I will start there unless someone can advise otherwise. Application is in a GL Speedster with Suby engine and 915, so a bit *** heavier than the Beetle

Thanks for the help