About this 3D model

So i threw together a 4-bolt brake booster for my trial bike. I originally intended to just get some waterjet cut from 1/4" aluminum, but the cost was high. Instead i machined them out of 1/4" aluminum. It has 55mm of spacing between the center of the top bolt and the bottom of the arch (where the tire would touch). I'm using 18mm spacers that are ~8.5mmOD and 5mmID. I am also using 45mm M5 socket head cap screws. These values might need to change based on your brake clamps and mounts.