The Phase 5 and Phase 6 rear wing fits both the XD and XE Falcon, along with the XF. It was originally designed for the 1980 XD Group C race car before CAMS decided to not alloy a gap between the wing and deck lid. It is a wind tunnel tested wing. It works! It was later used as the Ford wing for the AUSCAR XF Falcons at the Thunderdome.