I'm looking help concerning the spare tire hold down strap on the Series II. The one off my car is in bad shape and maybe missing parts (metal clip? buckle?). Not exactly sure how it is attached. One end of the strap the loop is torn and appears to be missing a clip or buckle? Or, does the buckle that is bolted down inside the trunk go through that loop? The other end of the strap has just a loop. Is that to put your finger(s) through to grip when tightening?