I am not sure if this is where I can request and update of these two teams but most of the other team pages are complete with their uniform history on this site.
For The Giants all uniforms are missing from 1925-2004 as well and the alternative uniforms. I have some of these if you need any help with this.
For The Rangers all uniforms are missing from 1926-1975 as well the alternative uniforms and the special event uniforms. Again I have some of these if you need any help with this.