I think you will find its the foot operated windscreen washer not dip switch, at least it is on my 82 GTLMy GTL rubber mat looks like the one on the top right. It has the little rectangular cut out section at the base. But I have no idea why there is a round cut out where it fits to the centre consol.
The one on the top left has what is probably a cut out for a floor mounted handbrake and the little round hole at the top left position could be for a foot operated dip switch