Jack first gun Shop is an excellent source of ofter difficult to find parts as well as most common repair parts. They also manufacture manyu parts intheir shop. They are knowledgable, courteous and efficient in filling orders. I recommend them highly.
P.S. Their catalogs have over 2700 exploded drawings and is well worth the price if you repair guns or are a serious student. It is a better value that Gun Digest's book, Exploded Gun Drawings, which has less than 1000 drawings at a similar price.
A phone call will tell you if they have the part(s) you need.