I'm a little late here but: 1993 is one year unless you change over the valvebody, solenoids and wiring.
B ----------
CUTLASS 93 A.T.; 4T60E, 6-207 (3.4L)
GRAND PRIX 93 A.T.; 4T60E, 6-207 (3.4L)
LUMINA CAR 93 A.T.; 4T60E, 6-207 (3.4L)
|A| thru |C| fit as shown in notes.
B -----------
Valve body cover is steel & has no engine mounting bosses .
|A| & |C| fit by transferring valve body wiring harness, solenoids & electrical connector in case as needed.
A ----------
CUTLASS 91-92 A.T.; 4T60E (3.4L only)
GRAND PRIX 91-92 A.T.; 4T60E (3.4L only)
LUMINA CAR 91-92 A.T.; 4T60E (3.4L)
C ----------
CUTLASS 94-95 A.T.; 6-207 (3.4L)
GRAND PRIX 94-95 A.T.; 6-207 (3.4L)
LUMINA CAR 94-95 A.T.; 6-207 (3.4L)
MONTE CARLO 95 A.T.; 6-207 (3.4L)