Went and took a few quick pics outside. It was raining so excuse the quality and the messy engine bay.
This is the first radiator in your post from a t? cortina..
To mount it, you will need to trim the back so that it slots in and mounts from the engine side with the two smaller tabs.
You will also need to cut the bottom of the radiator section and weld in an 'L' section so that the radiaor will fit. These can be purchased from a few different people on here or simply make your own. Alternative you can space the bottom of the radiator out but you will need to shrowd the sides of it.



The bottom radiator looks like it has a top tank from a MK1 or MK2 cortina although the mounts do not match up. It may or may not fit as described above.
For reference, here is a pic of my car when I trial fitted a twincam/mk2 cortina radiator...

Hope it helps.
Shaun