Following Website would have the part: www.fnacpartsaccessories.com
'''OR''' call order support by entering this number: 1 -800-800-3854 #4
Though I am not sure they sell these parts, looking would help enough. Try a homemade method, such as attaching with glue, hot glue, super glue, tape if unable to find the item you are looking for. It is pretty rare to find parts from delicate pieces such as cameras for production reasons, though I havent looked myself.