Form 1660/Group 2 details all general evolution of the car.
On the body kit, this had to be homologated in period and is on the form.
The 5 cm wheel arches have to be added to the OA width of the car which is mentioned on page 5 and these items are detailed under page 17 of that same form under part no. 9050971/1/2/3/4.
Body kit or specificaly the wheel arches extensions were never free, only that before the 1975 FIA Bulletin, these had to be Homologated and were specific to each cars and from 01/01/1976, they became controled items and were featured directly in Appendix J as the so-called "round wheel arches extensions".
What was cheating in period, still is..!
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