Vintage Windmill and Wind Generator Forum

In digging through my great-grandfather's stash of windmill parts, there are a few pieces that have me stumped. Anyone know the windmill to which these section castings belong?
(Of course I only have 5 sets!)

It is the wheel hardware to a wooden bladed mill. The long bar is what is commonly called the dog bone and the other two pieces are attached to the ends of the long slotted boards. The other two are usually referred to as the wheel clips. All three pieces go on the Beaty (Canada} or the Duplex (US) vaneless wooden bladed mill. Like you said. You only have 5 sets. The 10 foot mill requires 6.

Thank you for the answer Paul!