The name on your lens should be same words, if not, Please check the full name on your lens with lists in the store categories, there must have a cap just for your lens.
Please note: Olympus made three 14-42mm lens,all different caps. one is Olympus Zuiko Digital ED 14-42mm 1:3.5-5.6, lens on 4/3 camera E-3 E-5 e-300 E-500 E-400 E-600. the second one is Lens CAP for Olympus M.Zuiko Digital 14-42mm 1:3.5-5.6, lens on M4/3 camera e-p1 e-pl1 e-p2, the third one is Olympus M.Zuiko Digital 14-42mm 1:3.5-5.6 II, lens on M4/3 camera e-p3 e-p5 e-pl2 e-pl3 e-pl5 e-pm2. Please note all three items are different name and different cap. Please check the item name with your lens clearly