I wouldn't bother fitting a used one with that mileage personally. Given the amount of work required to fit it, you'd be better off starting afresh with a reconditioned one, or brand new. £1000 inc VAT for a new from aftermarket suppliers, or a recon will set you back about half that, but will benefit from better bearings if you ask for them. For a bit more you can spec a hybrid or mildly improved one.