Bilstein B4 on Sri 3.0 Cdti Estate?

[stoph]

Quick question... picked up a 2006 vec SRi 3.0 cdti estate this week and now having fears is going to turn into a money pit! Rear shocks leaking and osf suspension occasionally 'sticks' and wont move.. this morning fine, 30 miles later seized solid! Obviously theres quite a price difference between Bilstein b4 and b6 and I'm not going to complain at a slightly more compliant ride...boy racer days are over!
So the question is are the B4 Billys a straight fit with the SRi springs and bigger front brakes of the 3.0...if its just 25mm spring length difference on the sport suspension then I'm happy with that.. if they are a pain to fit then its not an option! Thoughts at the minute are B4 all round as its done 91000 miles and all shocks look original (new front springs at vauxhall 20k miles ago...hoping they are ok for now, budget wont stretch to a set of eibachs AND shocks.. should just feel a lot better with suspension that moves at the front...and moves less at the back!!
Thanks in anticipation..

[jrh1]

Refit originals, b4s are too soft for sri.

[dh.dti]

B4 are not uprated over standard kit... imo the Monroe Relfex are better & i have them on my Elite

[Ian-Highlander]

I've got the B6's on my estate along with H&R springs and it's superb.