The Focus radiator has inlets and outlets in the same location as the carb type rad that will be in your spyder, however it is much wider, so some messing around with hoses is required (more or less same diameter inlet/outlets). It does not mount where the original one does, it sits forward (which you need to clear the DCOE webers), and has 2 round plastic peg type mounts upper and lower which normally secure it in place through rubber grommet type mounts. I drilled holes in the base of the front crossmember to mount the lower mounts, and secured at the top with aluminium angle strips to form a C type section over the top of the core, fitted self adhesive foam inside angle to protect rad, then riveted angle in place either side of engine brace.
The bottom outlet runs very close to the bottom of the alternator, you need a hose with a fairly tight 90 degree bend on it, but it just clears. The small pipe from the expansion tank has to be run all the way around the top of the rad, so a long hose is required here, I used 6mm ID hose for this. There is also a roughly 1/2 to 5/8 size fitting on the side of he rad which will have to be blanked off as it is not used.
So not a direct replacement, but can be made to fit without too much hassle. I was also looking at Renault 5 turbo radiators as well, but think this is a better option.
The fan I used is off a Thermo King Bus Air Conditioner, and is front mounted, so it pushes air through the rad and is a lot more powerful than the original. I used a T piece in the top hose to mount the original electric fan switch as there is no provision on the Focus rad for this, but I am not happy with the operation of the switch at the moment, so I have wired in an overide switch as well. The fan is hardly aver required though as the rad is very efficient at any speed, and I live in an area where it gets to 40 Degrees C plus!!