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Re: <E30> rear shelf panel bolt holes

>While I had the fiber board rear shelf out (for new rear speakers), I 
>noticed
>there are three threaded holes in the metal panel beneath the fiber 
>board. One
>of the bolt holes is in the middle, with another two positioned directly
>behind the driver and front seat passenger, respectively. Curiously, these
>holes don't seem to be threaded for metric bolts (none of my available M8 
>bolts
>fit), but a 5/16" SAE bolt fits perfectly.
>
I think you will find these are for retention of a child safety seat.  
Why they are 5/16 SAE I do not know unless it is part of the Fed's safety 
standards.  I've found them handy for mounting things in the trunk.

Stu Raike
St. Louis