For the record, M-body factory tire/rim sizes:
1980-83
Standard on 318 retail cars was 195/75R15, 5x6.5 rims
Squads were 215/70R15 on 5x7JJ police steel
1984-89
Retail cars were 205/75R15 (not 205/70) on 5x7J solid steel
Squads were still 215/70R15
Common practice, especially with state...