Water Pump C280, 1999 Replacement

[speedybenz]

I am going to replace my water pump in my 1999, C280.
Is there an inlet to the pump that coming from the engine block?

I can see the two different sized hoses coming from the water pump, but I am guessing there is in the block entering the water pump from the back side of the pump?

So that would mean I need to get a gasket?

Can someone help?

Thanks,

Jeff