1977/82 351M = 11" 5 springs / D7TZ-7550-A
disc & E0TZ-7563-B plate.
1977/78 400 = 12" 8 springs / D7TZ-7550-B
disc & D7TZ-7563-B plate.
1979/82 400 = 12" 5 springs / D9TZ-7550-A
disc & D9TZ-7563-A or E0TZ-7563-A plate.
1983 6.9L = 11 7/8" / E3TZ-7550-H disc
& E3TZ-7563-G plate.
1984/87 6.9L T-19 = 11" / E5TZ-7550-G disc
& E5TZ-7563-B plate.
1987 6.9L ZF = 11" / E7TZ-7550-D disc &
E7TZ-7563-C plate