Was out for a drive yest and went over a dip in the road (pos a little too fast

) and my already old and worn suspension gave up on the rear passengers side.
Realised it was sitting lower on one side so had a look under the car and the strut and spring, instead of sitting upright as they do normally are now resting/pushed up against the side of the wheel arch (away from the wheel)....does not look right at all!
There was a post up a while back about someone having a similar prob (has been deleted now so cant go back to it) but I think I remember the cause being a knackered bump stop...does that sound like whats gone?
I have new sus to fit anyway just hope there isnt any internal damage.
When replacing the rear sus what do i need...fitting coilovers so....new bump stops and top mounts, is that everything?
Cheers