With the information given we have no idea which one you are looking for. Almost every major model Co. makes a Piper Cub. I own the Carl Goldberg kit. It is an easy build and can be built either Clipped Wing or standard. Here is a link for that one.
http://www.carlgoldbergproducts.com/cub.htm
... and here are a few others...
http://www.balsausa.com/kits/kit.htp?id=18&shopperid=
http://www.balsausa.com/kits/kit.htp?id=17&shopperid=
http://www.balsausa.com/kits/kit.htp?id=23&shopperid=
http://www2.towerhobbies.com/cgi-bin...?&I=LXMUL8&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXFG00&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXJ568&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXBDF1&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXFF96&P=0