Sylvana,
Do you have a West Marine near you? What kind of anchor was it? Was it a Danforth? a Mushroom? I have a #14 Danforth style anchor for my 180BR and it is more than enough anchor for my boat. Any local marina in your area should carry a wide selection of anchors as well. Check them out and I bet they would have one that will work for you.
Happy Boating
Kerry
"I would rather be lost on the lake than found at home"