Well what you need to do is :
Alci 's IMG Editor 1.5

Link to download Alci IMG Editor 1.5:
http://www.mediafire.com/download/ao1htl55wl7xaea/Alci%27s+IMG+Editor+1.5+GTA+Productions.rar Copy the Link ;)

Step's:
1.Open Alci IMG Editor 1.5
2.Go to ,,Open'' setting or blue folder
3.Search GTA SA models folder
4.Click on GTA3.IMG
5.Then press on ,,Import (remove if exists)'' option
6.Search dll and txd files from Monster Energy Pack
7.Then press ,,Save'' Option
8.You are done Congratz!

Credits:
xStefanOnlyHim