Custom radiator

[WLAcopilote]

I am looking for a "custom" radiator to cool a 3.9 litre Rover V8. I would like it to be the same as the standard 3.5 litre Range Rover radiator but a little narrower (i.e. the side tanks closer together by about 75mm).

Can anyone advise a good supplier who could either make or suggest a similar "standard" component to do the job?

How do aluminium radiators compare with O.E cost-wise?

Matt