Follow these steps and you will be able to install a car "in a minute". - download a mod (for example a car mod) and extract the archive where you want. - download ggmm and copy ggmm.exe and gtainterface.dll into san andreas main folder. > c:program filesrockstar gamesgta san andreas - run ggmm and search the car you are going to replace.. Weapons and cars: weapons and cars are the easiest ones of installing with ggmm step 1-first download the custom weapon or car you want. for example, i got an ak-47. step 2- open ggmm, and then click on weapons in the corner of the menu.. Gtainside is the ultimate mod database for gta 5, gta 4, san andreas, vice city & gta 3. we're currently providing more than 45,000 modifications for the grand theft auto series. we wish much fun on this site and we hope that you enjoy the world of gta modding..