I bought a 2007 GMC Sierra New Body Style Club Cab.

I have done TONS of work on it.
Brakes, replacing the interior and it's almost done.

I bought a tail gate from a junk yard. Told them what I had and they sent me a tail gate. However, it does not fit. The driver side tail does not fit, it looks too small. The passsanger side looks like it will fit. Is there something I need to do or add. They junk yard said it should fite... Should... Great.

Anyone?

Thanks.
Paul