Thanks to Graham Woods for the entry lists.

1963
Name:  Motor Racing Levin #6 Sports Car Entry List 1963 Graham Woods .jpg
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See a few Mistrals in the entry and the Kato Special which had a De Joux like body as did some Bucklers

1958
Name:  Motor Racing Levin #7 Formula Libre and Sports Car Entry List 1958 Graham Woods .jpg
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Results from Milan Fistonic
Result: 1st Merv Neil (14), 2nd Ray Thackwell (30), 3rd Len Gilbert (33), 4th Ted Avery (23).