chiaki

Hi! I'm new to this site but I need some help. I want to purchase a vertex kit for my 2004 is300. However, vertex stated that the rear lip will only fit the jdm bumper. You could modify the usdm bumper to make the lip fit but I want to purchase a jdm bumper and mount the lip on that instead to replace my usdm one. Will the jdm bumper fit my usdm model without any mods? Also, will the crash bar be affected in any way if I can use the jdm bumper and vertex kit? Any help is appreciated! Thank you!