Cheeky Mike, you wont be able to use the correct fan with the proper fan extention, with your radiator.
The correct radiator has a scollop (cut out) in the top tank for the fan to swing in. the top pipes in the proper radiator are also different as is the pressure cap. The best answer to all this is to find the right bits, all of which I might have spare.. Anyhow, must go,...got to get back to my skipping. Bye...