Me again

I have an annoying issue with the drivers seat having movement in it, so when accelerating it tilts back and when braking it tilts forward. I have found a few other posts with similar issues but can't really see a resolution to it. I have been out this morning and found the problem is relating to the bolts holding the seat to the mount for the runners - see pics below;





What will be the best way to resolve this, cut the bolts and refit or any other ideas?