You can use EG springs and struts on the front of an EF, but you must use the EG upper wishbone as the struts run a slightly larger diameter. These bolt straight to the EF mounting point and the strut. The rubber cups at the top of the strut may need to have a slight internal trim to make the springs seat properly. Rear springs will swap too with no mods. This also is true of the later 'teg springs and EK4 struts and springs (although you must still use EG wishbones.