Pete..If you would like outboard brakes .. try here
http://www.cobraracing.com/ProductsP...k2000Main.html
There is also another after market Jag suspension mob but they dont use the outboard brakes.
http://www.cwiinc.com
I think that cobraracing mob used to supply Robnel with rear suspension bits and pieces. Don Pillings robnel has that wide alum bottom A-arm
Also of interest is that watts linkage which does away with trailing arms.
Hope this helps
Cheers