To use the 4 gaskets on the valley pan or not?

I went to replace the valley pan gasket (oil leak coming from it) and the new one came with 4 other gaskets to go with it. The old one (which was the same felpro it looks like) didn't have these on it. And I've read online other people said they didn't use them either. So are they even necessary? A lot of this stuff is still new to me.

Here's the replacement I bought: http://www.jegs.com/i/Fel-Pro/375/1215/10002/-1

It's for a 440 block.