How do you know that has spacers fitted? Could just be the right offsets
Hellaflush - When the tyre is flush to the wheel arch, requires the right offsets & suspension setup
Offset - The offset of a wheel determines how far it sits out or into the arch. The lower an offset the further OUT it will sit, the higher the offset then the further IN it will sit
Air - Cars fitted with airbag suspension, allows for a car to be fully slammed.
Stance - The way that the wheels & suspension sit against the bodywork. Again the better the setup the better looking stance you have
Rolled arches - Pretty straight forward, the lip inside the wheel arch is heated & rolled to run more agressive wheels.
Spacers - Spacers will push your wheels out further thus lowering your offset
Camber - This is the angle that your wheels sit at - like / \ would be negative camber \ / would be positive camber
Think that covers everything
I would get pictures to show you each one but I'm lazy, maybe tomorrow