You did not specify the model of your car, it is important for us to know what car you have to replace this car part with. Of course, there are sites where you could search from, net is awesome with regards to that. Why don't you try browsing this, it'll help you somehow. Go check this site, ( http://benedict.isomedia.com/homes/giznaz/M44CamSensor/M44CamSensor.html )you'll be given basic on this matter. But if you're not that sure you can do it, ask your mechanic to do it.
Just be sure to buy the right car parts for your car.