dont listen to this guy, dont push. It should go in easy. If its not going in, check your motherboard placement. You dont notice that you placed it wrong on the tray until you put in the video card, and oh, its not fitting right.
I really dont get what your problem is though, is the card ending up too far from the mounting plates, or too close to them, when you sit it into the slot... Because its not your mobo... its your chassis, i hope you know that.