Wide angle camera for Swann NVR8-7082

[AussieGSXR 0]

Hey guys recently purchased this for our home. Happy with video and such as we only wanted it for monitoring around the house not extreme detail.

 

http://www.swann.com/au/swnvk-870824

 

The camera's that came with it kinda miss alot around the camera and seems to zoom in abit missing alot, perfect for a corridor or something which i can use these as if I can replace them. Is there a wide angle camera I can use with this system. Does not have to show high detail just be able to read a number plate from say 5m away and not show people as just 3 pixels.