Use IMG TOOL. If you don't have, then download one for free. You can Google it, type
"IMG TOOL free download".

Then open your "gta3.img". It's located right on your GTA-SA Folder....
(Most users can found it in -- C:\Program Files (x86)\Rockstar Games\GTA San Andreas\models)
if not, then look to your search tool "gta3.img".

If you found it, open that with your IMG TOOL.

Now, open my file and with your IMG TOOL, replace your gta3.img TXD and DFF files from my "WEENA" folder.
(WARNING! BACK UP YOUR FILES FIRST BEFORE REPLACING! ANY ERRORS IS NOT MY RESPONSIBILITY!)
DONE