2001 Renault Espace steering rack rattles and bangs

On uor last mot we were told that there was play on the offside and nearside steering rack, it makes a rattly banging noise when you go over bumps etc,
we need to get it repaired to pass the mot so I wondered is it possible to replace gaitors/bushes or is the steering rack a whole part as on our old (94) espace? And how much it is likely to cost?
thank you