The Aerpro APS37 Speaker Plug Adaptors suit various Holden and Opel vehicles, converting the original speaker plugs into standard size aftermarket speaker terminals. The plug and play design enables speakers to be installed into the vehicle without the need to cut the original vehicle wiring loom, resulting in a simple yet professional installation that can be reversed at any time. The speaker plugs are designed to connect to the factory tweeter wiring loom in the vehicle.