9 1 ▁are ▁el ig ible ▁to ▁comp ete ▁in ▁Group ▁R ▁" H istor ic ▁Racing ▁& ▁Sports ▁Racing ▁C ars ▁( post - 1 9 7 7 ) ". ▁However , ▁cars ▁constructed ▁with ▁a ▁full ▁carbon ▁tub ▁are ▁specifically ▁ex cluded ▁from ▁this ▁Group . ▁ ▁Champions ▁ ▁C ars ▁used ▁in ▁Formula ▁Hold en ▁C heet ah ▁M k . 9 , ▁D ome ▁F 1 0 2 , ▁El fin ▁FA 8 9 1 , ▁H ock ing ▁ 9 0 1 , ▁H ock ing ▁ 9 1 1 , ▁List on ▁B F 3 , ▁L ola ▁T 8 7 / 5 0 , ▁L ola ▁T 9 1 / 5 0 , ▁L ola ▁T 9 3 / 5 0 , ▁March ▁ 8 7 B , ▁R alt ▁R T 4 , ▁R alt ▁R T 2 0 , ▁R alt ▁R T 2 1 , ▁R alt ▁R T 2 3 , ▁Reyn ard ▁ 8 9 D , ▁Reyn ard ▁ 9 0 D , ▁Reyn ard ▁ 9 1 D , ▁Reyn ard ▁ 9 2 D , ▁Reyn ard ▁ 9 3 D , ▁Reyn ard ▁ 9 4 D , ▁Reyn ard ▁ 9 5 D , ▁Reyn ard ▁ 9 6 D , ▁Reyn ard ▁ 9 7 D , ▁Reyn ard ▁ 9 8 D , ▁Sh rike ▁N B 8 9 H , ▁S PA ▁ 0 0 1 , ▁S PA ▁ 0 0 2