The springs, bolts, screws, top strap "figure 8", etc, of course are the same from side to side and even across more years. However, the four main parts of the two hinges are quite different and cannot be changed around. There is an upper right, and a lower right, and an upper left, and a lower left, all DIFFERENT!
I said this in a previous thread for someone struggling with a messed up windshield where pieces were used in the wrong places and the windshield would not work properly. I really hate to say this again, because I like and admire what he has done for our hobby. I really do not even want to mention his name here because of how much I admire what he has done. Maybe he has since corrected it, I haven't looked for a few weeks now, but as of then, it was still wrong. I did try to send him a message about it twice, maybe they got lost in email never-never land, but I got no reply and no correction was made. I do NOT hold ANY animosity due to this. However. M V's drawing of the windshield hinges in the gallery are not correct. (I really hated to say that

). Most of what he does is incredible!
When I was restoring the hinges for my '15, I spent a couple hours sorting through all the hinges I had. They ranged from 1914, to about one and a half set of '15 to early '17 (in very poor condition), to two nearly NOS later style ('20ish), and a small box full of loose parts.
I can post pictures here, if they are on my computer. However I have a great deal of difficulty getting pictures from my camera onto my computer. And the one that used to help me with such things is often no longer able to.
If you like, I can try to do a wordy explanation later, or I will try to find the previous thread that had some descriptions and some photo by others. To do the wordy explanation, would require I bring in the spare hinges I have since gotten to make sure I get the details correct. ( Isn't that always the way, I restored a real '15ish hinge that was in such poor condition nobody but a fool like me would restore it. Two weeks after I get it looking beautiful, rust pits filled with J B Weld, major twist and bent all straightened, structural crack welded, gusseted and brazed, not Stynoski material, but beautiful, and in the box waiting to be installed, a nice pair fell into my lap.)