Has anyone ever installed this rear view camera?

I bought this off ebay. I have a 2013 CX5 sport. I tried to install it today but as I was trying to put the camera into the license plate hole I noticed the pins that you squeeze on the back of it were refusing to push in all the way. Did I by the wrong size or is there a certain way to make it clip on?

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I can’t help, but you may get a better response if you can link to the actual item you bought, with specifications, rather than a picture that shows no identifying features.
 
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Pueblo county CO
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CX-5 Sport 16.5 6M
Sorry, the camera I bought from Amazon didn't have instructions either.