I suggest using a map editor to retrieve objects IDs, like MeD, KeD or Moo Mapper, anyway you can also find a whole list of objects inside \GTAIII\data\maps\gta3.IDE you must open this file with notepad.KeD: http://www.gtatools.com/filedb/action.php?action=file&id=33Moo Mapper: http://www.chronetal.co.uk/gta/MeD: http://www.gta-modding.com/area/index.php?act=view&id=7