Nis-knacks is located in Hawaii.

And for more bad news they only produce aftermarket accessories for Sentras (B13 and B14 chassis) and for 200SXs. In case you are still wondering though their site is
www.nis-knacks.com Drop em a line...get some support and maybe they may draw up a design for your 300ZX.
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Eugene (AKAFA1C)
93 Nissan Sentra SE 1.6L
www.akafa1c.nissanpower.com