I have one in my 4shared file in the link in my signature then look in the "candy wrapper" file and the "candy bar wrapper" file. There are two...one is for a birthday and the other is for Hollywood Studios at WDW.
My wrappers should measure 5.25 x 5.5 inches to fit a regular milk chocolate hershey bar. The best paper to print them on is glossy brochure paper but regular or cardstock will work as well.
These are super easy to insert a name and/or 3rd Birthday...whatever the occasion is...by inserting a textbox over the image. If you have MS Word, here is a link to a thread that will teach you how: http://www.disboards.com/showthread.php?t=2286193