Steering Boxes

Afternoon Quick and simple question hopefully!

4 bolt Adwest power steering boxes.. Are they all the same from early models all the way up to TDCi Defenders? I know Discovery 1 uses the same box also, what about Discovery 2?

Looking to buy a second hand unit off eBay to replace my 6 bolt box but dont want to be caught out if there is any differences!

Thanks, Ste.

Check the part numbers, look on suppliers sites.

You will also need the four bolt drop arm, as your six bolt arm has a different spline pattern...