For 1975, there were six models:
| The serial number system and locations were unchanged. |
| The sixth symbol changed to a "5" for 1975. |
| Calais Coupes were numbered 6C47S5?100001 up |
| Calais Sedans were numbered 6C49S5?100001 up |
| DeVille Coupes were numbered 6D47S5?100001 up |
| DeVille Sedans were numbered 6D49S5?100001 up |
| Eldorado Coupes were numbered 6L47S59?100001 up |
| Eldorado Convertibles were numbered 6L47S59?100001 up |
| Broughams were numbered 6B69S5?100001 up |
| Seventy-Fives were numbered 6F3S5?100001 up |
| Sevilles were numbered 6S69R6Q?500001 up. |
Sevilles sold in 1975 were considered 1976 models and all production of this model was quartered in the Detroit assembly plant, Code "Q"). Engine code "R" was now applied to the new 350 cubic inch Seville V-8.
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