Since GT6 has few premium rally cars, I thought this would be a great suggestion. Might not be able to keep up with the others, but it would look good in your garage. Heres a quick video to go along with it.
This car which is on GT6 belongs to Joginder Singh, who was the 1974 East Safari Rally Winner.
In this case, the last 2 pictures from OP belong to Andrew Cowan, who finished fourth place on 1976 East Safari Rally. And in 1976, it is the Colt Lancer as the GSR has disappeared from the Lancer.