This report concerns the simulation technique for longitudinal and transverse wakes, including results for some of the proposed collimator designs tested in the SLAC end station wakefield tests. The purpose of this exercise is to verify existing simulation results and to expand the work to include the latest proposals for collimator designs. Several collimator designs including; single steps to tapered structures have been simulated and the results are presented in this paper. For most of the test pieces proposed here there are calculations of the transverse and longitudinal wake functions and the corresponding kick factor or loss factor.