This is the black flywheel cover for the lower front of the transmission as shown.. they are for the 85+ Turbo 700 3sp +OD as found on most all Automatic 85-92 Firebird TA & Camaro

GM original part.

ENG: ENGINE, 5.7L, (5.7-8) 350 CID, V8, TPI 5.7-8(L98); ENGINE,3.1L(3.1T),V6(EXPORT) 3.1T(LH0)(EXPORT); ENGINE,3.1L(3.1T),V6,MFI 3.1T(LH0); ENGINE,3.4L,V6,(3.4S),SFI,OHV 3.4S(L32); ENGINE,5.0L(5.0E),V8(T.B.I) 5.0E(L03); ENGINE,5.0L(5.0F),V8 EFI CAR ONLY 5.0F(LB9); ENGINE,5.0L(5.0H),V8(T.B.I.) 5.0H(L03); ENGINE,5.0L,V8(T.B.I) 5.0(L03); ENGINE-GAS, 8 CYL, 5.7L(5.7P),MFI,HO 5.7P(LT1)

TRN: TRANSMISSION,AUTOMATIC 4 SPEED,4L60E,ELECTRONIC 4-SPD AUTO TRANS(M30); TRANSMISSION,AUTOMATIC 4-SPEED(THM700R4/4L60) 4-SPD AUTO TRANS(MD8)