Recently purchased a 96 Caldina Tz-G to carry baby,wife MTB etc round

Now bubs has grown to nearly 10kg im now on the lookout for a infants seat, having looked around nearly all of them have tethers, the question.....
Is there a bung or anything to be popped out in the car (i cant see one anywhere!) to expose the hole for the anchor bolt, is it well hidden or do i need a mechanic to drill a hole in an apropirate spot?
thanks for any info guys.