OPEN box GM NOS ACDelco distributor rotor. GM 1978533 / ACDelco D434.  This old stock part is long discontinued. Shelf wear to the opened ACDelco packaging (see photos). Various Chevrolet, GMC, Oldsmobile, and Pontiac vehicle models 1984 - 1991. 

Check photos for cosmetic concerns before you buy. Check your VIN for correct fitment at your local GM dealer before you buy.