rear deck should be 6x9 (at least that's what's in both my 82 Mark VI and 88 MGM). Front door should be 6.5 direct to the door, 5.25 with the standard pod and 6.25 with the premium pod. 5" in the dash so adapters for 4 inch would be the need there if you use those spots. All 6 locations are loaded in my Mark

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