I can't help with parts except to suggest www.gunpartscorp.com
as a possible source.
As for removing the extractor, it is very easy. Using a non-marring tool, like the bullet point of a rifle cartridge, push down and forward on the curved part of the extractor that is just behind the clip guide. The extractor will pop right out. But since the extractor retains the firing pin, be careful that the firing pin doesn't fall out and be lost.