I seemed to have misplaced the 2 bolts that fasten the rear license plate to the back of my '71 240Z. I've tried some odd spare bolts and some are close but are not quite the right size. Does anyone know the correct diameter & length of the bolt?

Thanks in advance. Steve

I'm using 6x1.00 mm bolts with integrated washers. They are about 15mm long.

Thanks, Jim!