I bought my rad from a local company that make them for F1 stock cars - big American V8s!
The guy there suggested having a bespoke radiator made from standard components.
We established a Landrover header tank was the optimum depth in the Cabrio nose cone (same for Sportster?). Then he said he could fit a 3 core to virtually any width I wanted). This was the result:
I fitted a 16" Spal pusher fan with a sealed shroud.
I was able to have the fittings angled to best suit the pipes on my engine, and have auxilliary fittings for the temperature sensor, and top bleed hose return to the header tank added.
And all for the same price as a standard tank - £150.
It is important to close off the areas around the radiator to prevent air going over it rather than through it. I glassed in a sheet of GRP to the nose cone and then trimmed to suit with the radiator installed.
