I want to change the front derailleur on my stock gary fisher marlin. It is a 24 speed. The question I have is which of the top shimano components would be compatible with my bike, if any. When I look at their website, it says for use with 9 rings. Can I use the deore xt or deore lx as a replacement? As stated earlier everything on the bike is stock, except the pedals. Thanks for you help!