For example , the 1968 FIA rules state that `` production '' for sports cars need to have at least 25 identical cars produced within a 12-month period and they were meant for normal sale to individual purchasers .
For example , the 1968 FIA rules state that `` production '' for sports cars need to have at least 25 identical cars produced within a 12-month period . They also were meant for normal sale to individual purchasers .