That being said, you can try searching for the Wii System Menu 4.3 WAD file on reputable websites, such as:
Would you like more information on Wii system menu modifications or WAD file management? wii system menu 4.3 wad download
Select the latest 4.3 version for your region: USA: v513 4.3U EUR: v514 4.3E JPN: v512 4.3J KOR: v515 4.3K That being said, you can try searching for