Looks like a safety issue to me. A engine/transmission mount mounts to a assembly that connects to the lower radiator support. If that support goes, the engine drops forward and who knows what will happen next.
The replacement part only shows the lower support, but the unit on the car is a complete assembly from the bottom to the top. Looks like the defective support would have to be cut from the assembly and spot welded back on. This thing is part of the frame of the car.
I am going to call Nissan but I am sure they care less.
Oh by the way, my 94 Bonnie looks better under than the 99 Nissan and they live at the same address. I think this is a dirty secret for this series of Nissan models and it really disturbs me.
We also have a 05 Altima and I see there as been some different treatments done to the frame units. BUT, we received a notice that because of corrosion issues, the warranty has been extended from 7 years to I think it was 13, maybe 11, in certain areas. I think I might have made another mistake.
I am not a happy Nissan camper at this point. But I will get over it. It was a happy day when I got rid of my Z.