There isn't one.
The distributor is called an optispark, and is located on the front of the engine behind the water pump.
It is at the rear of the engine and has the plug wires coming out of it.
http://www.classiccarauto.com/impala/how_to/images/distributor.png
behind the engine you'll see a black circle with 7 plugs coming out of it. that is the distributor cap. take the cap off and you'll see the rotor.
On the 2.8L V6 the distributor cap is held on with two screws. Unscrew the two screws and pull straight up on the distributor cap to remove it from the distributor.
Which engine.
To change the distributor cap on a 1996 Impala SS, first disconnect the negative battery terminal to ensure safety. Then, remove the wires from the old distributor cap, taking note of their order for reassembly. Unscrew the cap from the distributor, replace it with the new cap, and reattach the wires in the correct order. Finally, reconnect the battery and start the engine to ensure proper function.
If your S10 has a 2.2L engine, it doesn't have a distributor cap.
1,8,4,3,6,5,7,2
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Very Carefully
It doesn't have a distributor cap.