metal bar former

[iowa]

here is a diagram of this metal bar
that is welded to the sliding window channel guides
and top left longeron at it's ends,
and is basically centered on the sliding window area.
it is the one on the right in the diagram
that the side fabric is wrapped around
my question's are:

what is it's part number?
what are it's dimensions?

thanks
iowa

 

[iowa]

 

[longwinglover]