if(dialogid == VEHICLE_CONTROL_DIALOG+7)
{
    new string[128], Float:X, Float:Y, Float:Z, Float:angle;
if(strlen(inputtext) < 1 || strlen(inputtext) >  return SendClientMessage(playerid, COLOUR_ERROR, \"Rosz rendszám!\");
else
{
    format(string, sizeof(string), \"Beálitottad a rendszám táblát erre: \'%s\'.\", inputtext);
    SendClientMessage(playerid, COLOUR_INFORMATION, string);
    GetPlayerPos(playerid, X, Y, Z);
    GetPlayerFacingAngle(playerid, angle);
    SetVehicleNumberPlate(GetPlayerVehicleID(playerid), inputtext);
    SetVehicleToRespawn(GetPlayerVehicleID(playerid));
   GetPlayerPos(playerid, X, Y, Z);
   SetVehiclePos(GetPlayerVehicleID(playerid), X, Y, Z);
   SetVehicleZAngle(GetPlayerVehicleID(playerid), angle);
   PutPlayerInVehicle(playerid, GetPlayerVehicleID(playerid), 0);
   SetVehiclePos(GetPlayerVehicleID(playerid), X, Y, Z+2);
}
}
return 0;
}

Hát ez nem valami nagy cucc...