Depends on what parts you are speaking of. The CD started with -10 and evolved for many years afterward, a bit at a time. The best thing you can do is get a parts book for your exact model. Armed with the part numbers, you can go to any Evinrude dealer and he can order the part if still available.
And don’t forget the Webvertize ads pages on this website. Ads are free.
EDIT: It isn’t called "Webvertize" any more. Now it is "Classifieds". Still free.