So I traded my 2018 Civic Si in and pulled these off of it before trading it in. Had them on for under 2,000 miles.
Acuity throttle spacer - $60
Acuity shifter bushings (weren’t even taken out of package) - $45
Cusco tower brace - $110
We can work on shipping. Acuity parts will be shipped via...
So I know there are some threads on the bumper fitment issue but it didn’t completely solve mine. Attached is the brief video I made on what else I had to do to fix it.