Yes Cruiser Dan, the Japanese have there stuff, very much in order.
I was able to remove the two side brackets from the factory radio and cassette, and attach these directly to the new Sony stereo (in the provided holes).
I then bolted the new stereo, straight back into the dash of the Battle Cruiser, via the original 4 mounting bolt holes.
FYI, despite the instruction manual suggesting the use of the RCA plugs for new rear speaker plugs (at the rear of the new stereo), this did not work.
After initially wiring the new rear speakers into the stereo, via these RCA plugs, I removed these and wired the speakers, directly into the accessory wiring harness. And Bingo, I now have a great 4 speaker sound system, for the new stereo!
Hope that helps
D'oh!
Homer