Changing item appearance opcodes

Hi, I'm venturing further in the marvelous world on modding. To create items I decided to use tp2 commands to copy existing items or effects in order to keep the names and description written, since it was always getting deleted when I tried creating them with DLTCEP.

I know now how to name and change descriptions. But what is the correct coding to replace the item icon? That would be of great help. Thanks!