Top 30 best-selling American Passenger Cars in 1975
1. Oldsmobile Cutlass 324,610
2. Ford Granada 291,140
3. Chevrolet Chevelle 276,206
4. Ford Pinto 271,880
5. Chevrolet Monte Carlo 267,803
6. Chevrolet Nova 256,438
7. Plymouth Valiant 225,379
8. Chevrolet Vega 212,876
9. Ford LTD 201,180
10. Ford Mustang II 193,273
11. Chevrolet Impala 189,067
12. Buick Century 183,666
13. Dodge Dart 163,639
14. Cadillac DeVille 161,179
15. Ford Maverick 140,645
16. Chrysler Cordoba 140,573
17. Chevrolet Camaro 138,679
18. Chevrolet Caprice 115,812
19. Chevrolet Monza 113,946
20. Plymouth Fury 103,500
21. Ford Elite 96,848
22. AMC Hornet 94,522
23. Pontiac Grand Prix 94,363
24. Buick LeSabre 94,206
25. Buick Electra 225 92,427
26. Mercury Monarch 90,429
27. Pontiac Le Mans 90,418
28. AMC Pacer 88,641
29. Pontiac Firebird 77,607
30. Oldsmobile 98 76,616
https://www.thetruthaboutcars.com/2011/10/best-selling-cars-around-the-globe-when-oldsmobile-was-top-of-the-class/
GM had 17 cars in the top 30 back in 1975, now they have only 4.