I just spent a day at a salvage yard which luckily had a Jap spec 6GC. I got all the little bit's i needed to get mine 100% perfect but also found the celica had a switch just by your knees on the right by the fuse panel (mines RHD).
So whats this normally for as it's a genuine toyota part but my Jap spec just has a blanking plate so i took it anyway for some purpose i'm yet to decide on.

there is the headlight leveler in one spot and the headlight squirters in the other. Post up a pic if you can so I can verify