Either remove your radio from the car and measure its size and check its fitting and what type and position of connectors are on the rear ( sockets/aerial/wiring connectorsetc ) so that when you look at others , you can compare.
Adapters are available for connecting virtually any unit to your car`s wiring , but you really have to make sure that you are buying the correct item ( It can become quite complicated)
If you don`t want the hassle , that then it`s a trip to a Audio Specialist ( eg Halfords etc) and let them sell you one complete with installation.
RegWorts
June 2008