Post some photos.
What model derailleur do you have?
Are hangers bike specific
Yes, scroll through the following page to see the many different designs and shapes of hangers.
http://wheelsmfg.com/products/derail...html?limit=all
Derailleur hangers aren't derailleur or speed specific that I know of.
Derailleurs do have specs for what type of cassette can be used with them.