WATER PUMP PARTS LIST MISSING 2 PARTS!?

[Paparex]

Well Heck,, im trying to figure out why I have 2 more parts than the exploded view shows for the water pump assembly. On the back of the impeller there is a black rubber cup shaped insert that fits snug inside , then there is a white plastic or "delrin" washer that fits in it snug and that is what contacts the mechanical seal. why aren't those parts shown on the exploded view?

[Dekon]

What year?

[Paparex]

sorry, its a 2001 200.