What I was saying, is the hybrids are always said to take the 1/8 (which i have), and the combo would take HB diffs. So I'm trying to figure what the difference is. I've also read that the combo's come to fit the stockers too? So yeah, I'm totally confused!

The hybirds are a type of combo bulks. They are just 1/8 diff combo bulks.
The reg combo bulks are for stock diffs. Hybirds are for 1/8. Simple really.