To install this is really really simple!
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You will need Alci IMG which can be found here: http://www.gtagarage.com/mods/show.php?id=17269
Or you can use Spark which can be found here: http://www.gtagarage.com/mods/show.php?id=1503
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But i recommend Alci IMG!
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So what you need to do is Open up your GTA San Andreas Directory go to models/gta3
and just drag and drop one at a time (once you put one in save it for Alci IMG)
Thanks for using this mod. :)
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(Not Important But You Can Read This Part)
You can use ALL of the models