steering boxes

Hi I am looking to replace my steering box but am unsure of the correct one - there seems to be different types, was just wondering if someone could advise me - please see pics - are all four bolt boxes the same ??
Thanks in advance
Stu
Will this do the job ???? Not sure if the image has been taken with the box upside down as mine looks a little different ??
http://www.ebay.co.uk/itm/290668069...WAX:IT&_trksid=p3984.m1423.l2649#ht_584wt_952

std adwest 4 bolt box fitted to defenders and disco 1 and rrc amongst 3 bolt and 6 bolt, one pictured on your link looks like a 4 bolt ,there are 2 types of drop arm fit 4 bolt boxes one with ball joint fitted to drop arm as with defenders and 200 tdi discos and one with ball joint in drag link as fitted to 300 tdi discos both are interchangeable, 4 bolts refer to number of bolts holding top cap with adjuster screw

Cheers james - have emailed him for an image of the other side of the box so im sure its the right one