You should have those in your car. Mine also a 73 coupe had them. If you feel along the rear parcel shelf pressing carefully on the vinyl surface, you should feel the holes in the far corners near the door shut. I made small holes i the vinyl and mounted the until on top, the captive nuts were already below. There were corresponding captive nuts in the floor under the rear seats. Cheers Ray
Hello Ray, Cheers for that fella - it’s very much appreciated sir! I’ll go and have a look later...One further quick question for you actually - do you know if the captive-nuts thread is imperial or metric please? Kind Regards, Guy.