[Vintage-race] Aluminum Hubs for Lotus Seven (front drum brakes)?

[John Donohoe]

I've heard of aluminum hubs for the Lotus Seven, but cannot find a source for them.
May car still has drum brakes all around if that makes a difference... anybody have a source or any insight as to the benefit on a road car?
Other than aluminum engine backplate and flywheel (already have) and aluminum head (can't spend the $$) what else is available to lighten a Sprite powered Seven? There's not much left to strip off it!

Thanks,John D.