Instead of searching for dubious downloads, spend 20 minutes creating a safe, personalized backup. You only need an SD card (2GB or less for older homebrew, but 32GB works with modern loaders) and a few free tools.
Soldering required. You can dump the corrupt NAND, repair it on PC, then reflash. This is professional-level repair. Wii Nand Backup Files Download
That said, if you're looking for a of a typical website offering such downloads (for educational or critical purposes), here’s an example: Instead of searching for dubious downloads, spend 20