phil, the bailey type damper isn't all that great tbh, i have one and it looks good but doesn't quite do the job it's supposed to (managed to snap the bracket on the turbo with mine)
needs more bracing to prevent movement of the turbo towards the head IMO, RS500 would probably be the best if you can fit one, and i know a seller on e-bay has them for around a ton if not i'd have one fabricated by your tuner,whoever that may be now or somebody good who can make you one up