5-speed had the springs for lever centering in the plastic box underneath the car.
http://www.fordopedia.org/parts-cata...esta-mk1/H6.12 (Parts 14, 15, 17, 30 and 16, 18, 31)


4-speed had a spring on the selector rod
http://www.fordopedia.org/parts-cata...esta-mk1/H6.10 (Part No. 23)
http://www.fordopedia.org/parts-cata...esta-mk1/H6.12 (Part No. 6; probably only for cars built after 1986)