1972 Rear seat squabs

Hello,can anyone tell me ( or have a picture) of how the rear seat bases clip in.There is a hole in the centre of the seat base and this lines up with a hole in the body.thanks
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prezoom wrote:Mine have a single self tapping screw, with a trim ring, through the lower front portion of the squab, into the vertical portion of the floor. Not sure if this is original, or added by a PO.