Mark,
Housings,
are all the same dimensions whether they be the 1.3 to the V6, alloy or steel they are identical other than a few extra bolt holes.
Axles,
from what I found after climbing over 20 or so G/Vs,Vits and Escudos is the easiest way to find that 26 short axle is to first look and see if the trucklet if fitted with Free wheeling hubs (they can be ether manual or autos). The short axle is only fitted to trucklets with FWH's ! I'd say if you find some thing post '95ish with FWH's it will have the right type of axle.
The one I found was from a late '90 diesel Vit so check them out too.
HTH Shane