T28 from turbo technics are £550 + vat, T3 (4x4 saff) is £426 + vat.
you can use them on the small turbo manifold but why you have the turbo off it may be worth changing the manifold aswell, the small turbo manifold is restrictive, if you look where the turbo bolts on the hole is a lot smaller than on a 4x4 saff of escos manifold.