Forgot to say that it was only between 3/4" to 1" i cut of the rear pipe of the centre section, made all the difference to the fit for the rear section, this was many years ago now and maybe they are better made as this was an early moongoose.
I am sure if you call either co. direct they will make whatever style you require for the rear box rather than the newer inward rolled ones they do as these i think spoil the exhausts.