Identifying Z51 Package on 1984 Corvette Build Sheet

I recently acquired a 1984 Corvette with cloth seats.  The owner stated that the C4 has the z51 suspension package; consequently, I reviewed numerous postings related to the build sheet, codes, wheel turns, etc.  to confirm.  I purchased the build sheet and the "z51 perf hdling pkg" was not denoted as an option; however Box No. 15 (Front Spring) and Box. No. 16 (Rear Spring), denoted BMB and BMH; Box No. 17 (Front Shock) and Box No. 18 (Rear Shock) , deonted TK and WJ; and Box No. 20 (Steering Gear) denoted AK. The shocks are black.   Does the C4 have the z51 suspension?  Any assistance would greatly be appreciated!