List,
There was an modification like that offered by the Brügelmann
mail-order
house as offered in the 76 catalog here:
http://www.wooljersey.com/gallery/veronaman/Brugelmann+1976+Catalog+Pa
ge+4+.pdf.html
Angel Garcia mentioned this some time ago on this list.
Looks similiar but not quite identical.
The other company next to OMAS or Cobra that offered lightweight tuning
kits was F.D. of Milano although I have no exact knowledge of their
product range. I just happened to buy a kit once for a set or record
brakes consisting of aluminium nuts for the brakeshoes, the brake axle
(non recessed) and front axle domed nuts.