as mentioned hood, fenders, headlights, front bumper, grill....

when u put the front bumper on, all the holes WILL line up except for two... but the thing is it doesnt really matter unless u really dont trust it and decide to drill the two holes so u have a screw in them to keep it snug and tight....

but basically u dont really modify too many things... i did this conversion to my EK a while back before it got totalled it was easy... you shouldnt go through all the trouble of replacing the entire core support... no point and its a waste of money