When you remove your Rear Shocks then the inevitable will happen. You will find one of the bolts has siezed or cold welded itself into the Bush.
You WILL end up cutting one off. Therefore make sure you have the correct parts to hand when you start.
This set consists of a pair of High Tensile Bolts (M12 x 70mm METRIC FINE - Bottom, M12 x 60mm METRIC FINE Top) )
Just by buying these should ensure that yours undo without any problems
This set fits ONE Rear Shock Absorber (Top and Bottom)