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Early 80's - Group 6 cars... Open top, Like early Lancias and the 'Jules' Porsche, etc.
About 1984 - changed to Group C - Closed top.
Grp C died early 90's, then people took tops off 962's and built 333Sp's with open top..
I shall check my sportscar books for more info, like why it all happened!!!
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