Good, used Wood ECU Cover Panel for all '90+ 300zx models.

Located under the passenger side of the dash board on US Spec 300zx models.  This panel is exposed to all kinds of moisture and dirt.  On top of this, add the occasional leaking T-Top or Heater Core to the mixture, and you can easily find yourself with a molded panel.

These cover panels are secured to the floor board with 4 M6 x 1.00 machine screws.