helmets dont work (for me anyway) but the other ones are the same size as the ep5 ones so those should be able to be imported right away.
Always good to have more icons to play with.
to get helmets to work you need to make sure the file is the same size as the ones in ep5 and helmets would work too. basically what you need to do is go to photoshop and cut out the new icons in 16.dds that are not in the one you already have and add them in 116.dds
edit:
I did it for you.

just import the 116.dds and the 131.dds and helmets should work too!