Determining the size of the factory speaker in your car can be tricky, as factory speakers dont always adhere to the same size standards as aftermarket speakers. However, there are a few ways to figure out what size speakers are in your car:

• Check the owner's manual: The owner's manual for your car should have information about the size of the factory speakers.

• Measure the speakers: If you can access the speakers, you can measure them to determine their size. Keep in mind that the actual dimensions of speakers within a certain size category can vary based on a manufacturer's design.

• Use an online database: There are several online databases that can help you determine the size of the factory speakers in your car. You can enter your car's make, model, and year, and the database will provide you with the speaker size information.

It's important to note that even if you know the size of the factory speakers in your car, you may not be limited to that size when upgrading to aftermarket speakers. With the right adapters and installation techniques, you may be able to install larger or smaller speakers than the factory size.