Do anyone have any documents that the lower plate was upgraded on the M1A2 and M1A1 AIM I have some but they don’t think it enough and I have been looking everywhere here are the ones I have.

Do anyone have any documents that the lower plate was upgraded on the M1A2 and M1A1 AIM I have some but they don’t think it enough and I have been looking everywhere here are the ones I have.
As you can see, they were upgraded 2001 or 2002 onward.
We have a 1999 configured SEP, and it has externally mounted TUSK option.
what about the AIM?
The AIM should have better hull armor