I don't know that mine has one but then again i can't tell where that goes by the picture. I did some looking previously and it seems that there are two different styles (pre/post 1991) of these 54" Haban blades. Maybe take a look here to see:
http://www.partstree.com/parts/?lc=c...%22+Snow+Blade
I was hoping someone would have the cross shaft support strap (part no. HA-14297) #43 on your diagram. There was talk of folks making them or posting dimensions a while back. If anyone has one and could post some detailed dimensions or wanted to get the dimensions to Jeff to make that would be much appreciated.