You are probably referring to the mount slots for the bow. 
Seems like that is a good idea for a windscreen mount, other than the
tonneau would cover the slots when installed....  Moss, wanna make a new
part?
Andrew
On Mon, 2004-06-28 at 16:46, Bill Saidel wrote:
> In my MGB (1976), just adjacent to the rear edge of  the front door, there 
> is a snap button for the top.  Directly behind it, just adjacent to the 
> front edge of the rear quarter panel is a rectangular socket, perhaps a 
> part called the top frame and tonneau bow socket (??-).  Has anyone used 
> this socket as the insert point for the supports of a wind screen?
-- 
Andrew B. Lundgren
http://www.Lundgren.us
 
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