In general everything is fine, the only problem is that I had to make a cut in the part that goes between the plate and the PCB, apart from that everything is correct.
The foam was shipped fast and makes my board sound amazing.
Really good quality foam, and precise cuts that fit perfectly - except for the highest layer of foam (between the top plate and PCB) : in the top part of the ALT case (I have the low profile model MDX-22176), there is a metal bar in the middle of that top plate, that crosses it horizontally, and blocks the foam. I'm afraid I'll damage the PCB if I try to push on it, I might try to cut the foam. Apart from that, it really compensates the hollowness of the sound on the ALT
Works perfectly, shipped quickly
Foam needed to be cut in order to fit in Drop Alt, despite that it makes a world difference in alleviating case ping and the hollowness of the board