Ed, it wasnt just HO cars.
Most 1982 T/A's and all 83-84 T/A's got the functional scoop.
Most 82's w/ the powebulge hood, (LG4 and LU5, priority was given to the LU5 cars), All 83's (LG4, LU5, L69) and all 84's (LG4, L69) got it also.
Shouldnt be hard to come by.
85 they went to the flat 85-92 T/A hood.