Don't bother buying a new rear mount Ad', buy a universal oval exhaust mount, remove the top half of the rubber X on the rear mount, fold the lower legs flat and cable tie the new mount in its' place. A much stronger option.
As for the centre mount, if it hasn't split, again don't bother with a new one. Instead, buy a mid size jubilee clip, square it off so it roughly fits around the middle mount, tighten until it is secure and cable tie in place again. This mount doesn't move a great deal but can easily snap if the Blueflame is heavier than standard. Alot of movement with this middle mount can also add a lot of stress to the rear but more importantly, the manifold to cat' joint leading to a blowing cat'.