Brand-new genuine GM discontinued NOS power steering reservoir cap.
This power steering reservoir cap is ORIGINAL for all 1987 Buick Grand National, Turbo Regal, and GNX with LEFT HAND THREAD Power Steering reservoirs. (See picture to verify your application).
Although this part is pictured with the original ACDelco box, our remaining inventory of this part was sent to us in bulk from GM and will ship to you re-bagged. It is NOT an AFTERMARKET/REPRODUCTION CAP.