Many car seat covers are advertised as having a “universal fit.” While that does mean that the covers will fit the majority of car seats, they may not always be the best fit. Often you can find information in the product description about the vehicles that the covers will fit best — SUVs, trucks, sedans, etc.
Also, front seat covers will be different than backseat covers, so make sure that you are getting the appropriate ones for your needs. If needed, you can always take measurements of your car seats or refer to your user manual to ensure the car seat covers that you order will fit your vehicle.