Just noticed the 2 hinges are designed differently. One kind of points up and the other down as in the pics.Click image for larger version.  Name: 20210803_200908888888.jpg  Views: 172  Size: 42.0 KB  ID: 13683Click image for larger version.  Name: 20210803_200859999999.jpg  Views: 173  Size: 40.3 KB  ID: 13684
On the body the hole they slide into are equal and straight. Wonder why its made that way.

Anyone know what the purpose of the metal part at the rear at the top of the roof is. Click image for larger version.  Name: 20210803_200808555555555555555.jpg  Views: 161  Size: 43.6 KB  ID: 13685Click image for larger version.  Name: 20210803_20081555555555555555555555555.jpg  Views: 172  Size: 51.3 KB  ID: 13686

And lastly what is the purpose of the two pieces attached to the rear frame. Theres one on each side. My 109 was ex military.Click image for larger version.  Name: 20210803_200755 (1)111111111111.jpg  Views: 164  Size: 31.6 KB  ID: 13687