Not sure what you’re doing wrong; but some general rules are that you should post an ad for wanted parts in the wanted section and for sale, in the for sale section. Put "F/S" or "WTB (Wanted To Buy) in the ad title, along with your general location, like "in MA" for Massachusetts, etc. Finally, put contact info like your email and phone number, in the body of the ad. If you don’t do this stuff, the moderators will ding your ad, the big meanies. (-: Mine get dinged all the time when I am being stupid and not remembering the rules. Rules are rules.
Long live American manufacturing!