Defender steering box

Just about done a deal on a nice 04 plate defender 90. The steering box is leaking pretty badly. I fitted a new ( very expensive ) ADWEST 4 bolt box to my 300tdi Discovery last year - if I strip this out of the Disco will it fit the 90? Forgot to look to see how many bolts the defender box had, are they the same box - maybe someone here knows what the spec is? If it's the same one I've won a watch and will be happy to break the Disco for parts.
Cheers, Roddy.

it will fit ,adwest are 4 bolt either disco or defender ,defender did use gemmer 6 bolt at one time but both fit the same including pipes

Woohoo, thanks James for a quick and knowledgeable reply, looks like I've saved a small fortune here, cheers.