Hi Pat,

There is a heavy plate with ribs behind the pivot bracket.  The ribs serve to add a bit of friction.  This plate is attached directly to the tub and through the pivot bracket.  The pivot bracket is attached to the windshield with the large pivot bolt in the center.  You can see the slot orientation on the pivot bracket.  There is a left and right side pivot bracket.  These brackets will only work one way. This will quickly become appearant when you are ready to set the windshield.

Hope this helps.

Philip,
I don't know of anyone that makes a reproduction.  I have seen them on eBay a few times, but folks were asking way too much for what is essentially a piece of metal with a couple holes drilled in it.

I made my last set out of some scrap 3/16" steel.  I cut the friction ridges with a hack saw.  Here is a shot looking down...