FIA vs Halibrand wheels on early 427's

[1985 CCX]

The early 427 cars CSX3002 to at least CSX3020 and CSX3026 used FIA wheels in early photographs I have. At what stage did the Halibrands become std on the 427 cars? Was there a specific car that noted the change or move forward?

[marcocsx3121]

Not that it's in any way definitive, since I was the third owner of the car, but CSX 3121 was wearing FIA wheels when I bought it in November 1969. I dumped them for the usual 7-1/2, 9-1/2 Halibrands a couple of years later.