This is what it says about them asking for your car & year.
"Many of today's vehicles require an interface module to create a seamless digital connection between your vehicle and the Viper system. Select your vehicle below to see if it needs a module. If your vehicle is not listed in the vehicle selection boxes, then please click the Continue button and talk to your installer about possible interface module requirements."
So its not necessary to know they year & car. It just makes it easier. Talk to someone at Radio Shack or Car Toys or your local alarm/tech shop that does instillations. But the system does work with the vehicle. =]]