Hi Al,
Thanks for the effort you went to with the dimensions and pics. The strange thing is that my brake setup is different to this, the guard does not have a cutout and the lever comes out from under the leading edge of the left guard. Don't know if it is a newer or older setup, probably newer as my rear wheels are secured to the hub with 3 bolts rather then a big nut on the shaft.
Maybe someone else will be able to assist. Thanks again for your trouble.
Cheers Keith