Anybody know what these are for? I don't see any identifying marks other than what appears to be 3388 written on one of the brackets.
They look like top iron supports from a two man top. Take a look at these images from Model T Haven for a 1915 Touring Car:
Hi Tom. It appears somebody has started to make 1911-12 top iron supports. They are unfinished and still need the tapered socket part welded on. This style with the horizontal arm / brace was used during 1911 and 1912 on the step sided touring cars. The longer ones are for the corners of the rear seat, the shorter ones could either be for the front of the rear seat, or for the front seat.