I found the monument online to Col. Vincent that I was talking about. The tour guide said no one knows exactly when it was put there, but it has been there since 1864.
Here is a link to it:
http://www.brotherswar.com/Gettysburg-Day-2Pic-55.htm
And it is right next to the 44th New York monument.
That one I have not seen. I will look for it on my next trip. Hopefully, next year.