What are the differences between 1955, 56, and 57 Chevy car hood latches?

[hursst]

Hello,

   What I think I have in the photos are NOS 1955, 1956, and 1957 Chevy passenger car hood latches, respective from left to right in the first photo.  These were found in an NOS parts stash.  The first one on the left is definitely a 1955 passenger car one, as I have the part number tag, 3723002 that was on it.  The other two did not have a tag.  When I googled a '56 and '57 hood latch, they did look like what I had in the photo, although the one in the middle either has the latch handle bent down a lot (as seen in photo), or it is from something different.

 

Can anyone out there confirm that the one in the middle is a '56 and the one on the right is a '57, or maybe those are from Chevy trucks?  Is the latch handle in the middle bent down, or is that normal for some other model or a truck?  Thank for any help.

Edited June 22, 2023 by hursst (see edit history)

[hursst]

...and a photo of the backs of each.