These cars would contest the World Championship for Makes series from 1976 through to 1980 and then the World Endurance Championship in 1981 & 1982. The FIA rules restricted the width of the car, therefore cars were built with standard body widths but wide mudguard extensions.
From 1976 through 1980, these automobiles contested the World Championship for Makes series.  In 1981 and 1982, they competed in the World Endurance Championship, all while adhering to FIA regulations that limited car width. To meet these rules, cars were built with standard body widths but extended mudguards.