The eleven Tz125 1998 4jt5 Italy 284jt-100e1b Waterpump component parts are all listed in this schematic.
Some items from this specific schematic: Washer, Plate(3yl), Impeller Shaft Assy, Washer, Plate(3yl), Pin,dowel (603).
With three applications this Bolt,socket is the most specified part.