These were made to be used with Alpine's SPX-PRO tweeters, which is a fairly large car tweeter. There are no holes cut yet, so you can drop pretty much any 1" or smaller tweeter in. They will need to be finished with fabric or texture and paint, but are ready to be finished (sanded smooth). These are on-axis to the drivers seat, meaning the left tweeter is pointed at the driver's left ear and the right tweeter is pointed at the driver's right ear. The shapes are different side-to-side because of this. You can use these as-is or cut out my handy work and re-build to suit your needs. Replacement a-pillars run $260+ for a pair at the dealer. I'm asking $65 shipped for the pair. Save your stockers for when you trade/sell the car and use these for your project.