Quick question about the wife's puma....

In the back on the panels either side of the bench seat, near the rear speakers, there is a slot on each side (meaning one on drivers side, one on passenger side), about the size of a coin slot for a 10p piece.....it's got a grey plastic circular surround going round it

what the fuckin hell are they? they look standard fit to me. fancy child seat fixings or summat?

will try get some pics tomorrow if nobody knows