I have decided to fix the radiator without first fitting the fans. I figured I could measure the space available once fitted which may determine where the fans go, on the front or backside of the rad!
I had previously fitted the brackets to the rad, now I just needed to align in the car and bolt to the body. This was straightforward after I had wedged it in the location I wanted with various bits of wood! I drilled holes and bolted through.
I also fitted the header tank. This just sits on top of a bracket that fixes to the chassis on the built in framework. You attach the header tank with a couple of large jubilee clips! I don;t like these and hope to find some better quality ones later.