Without the threaded receiver for the studs it will be tough to fab something up
I was lucky. Just the studs were broken off
I was able to weld new studs on mine
Picked up some 10/24 studs from the hardware store
And the nuts with the flange.
Not sure how you would tackle this
Maybe a 10/24 coupling nut but you will have to figure a way to attach them.
Anyone have a idea?