There are 3 choices

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(3.6L)
- VIN 3 (8th digit, opt LFX)
  - 170 amp (opt KW7)
  - 220 amp (opt KW5)
- VIN 8 (8th digit, opt LF3)
  - (170 amp, opt KW7)

Alternator for 2018 Cadillac XTS

Fits: 3.6L VIN 8 8th digit, opt LF3 170 amp, opt KW7 (change)

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