pto winch on 2001 defender

am looking at putting a pto winch on my defender only problem is i also wonted to put an overdrive on but they both attach at the same point on the transfer box.
Anyone no if the power take off units fit on a disco transfer box as if i fit a disco transfer box to my defender that will gear it up then i hope i can attach the power take off unit to the disco transfer box.

Iirc its all down to the input gear having the splines to engage to the dog clutch on the pto.
So its google picture study time for you, top of my head I cant remember how many teeth the disco 1.2 tfer box inout gear has?

Ps pto winches are the mutts nuts.