That's the correct blanking plug for the parking light(s) hole in the console plate. It would be twice as wide as the switch opening for the defroster glass switch. Early, early Zs like mine with no defroster had a blanking plug just like cbuczesk shows but half the width. The defroster switch came in two versions - lit and unlit. The earliest version, I understand, were unlit, black, with one white dot in the on position. The lit ones were green, I believe. I can't seem to find a picture of the parking light switches. Would love to see one. We discussed this ad-nauseum way back when during conversations about the optional fog lights and the fog light switch. If you want to search through the archives. Good stuff. I wonder if the wiring for the parking light circuit is already in the wiring harness.