In April 1968, the CSI announced that, as there were still too few entries in the 3 litres Group 6 Prototype category, the minimal production figure to compete in the Group 4 Sport category of the International Championship of Makes would be reduced from 50 to 25 starting in 1969 through to the planned end of the rules in 1971. This was mainly to allow the homologation in Group 4 of cars such as the Ferrari 250 LM and the Lola T70 which had not been manufactured in sufficient quantities to qualify (unless, in the case of the Lola T70, the open Can-Am cars were counted as well).