Basically you want everything from a T3 1.6TD.
It is VW lego, but with a few gotchas.
Sump and pick up pipe. (JX sump has union on for oil return line)
flywheel and clutch, spigot shaft is shorter on a Diesel.
oh, hang on, look here...
http://www.brick-yard.co.uk/VehicleSpecific/T3/info/mods/diesel.htmSave me typing!
The Diesel loom will just clip into the junction box and work, swap the instruments for Diesel ones and get your glowplug light too.
I have 90% of a kit here, the going rate seems to be around £400 for all the bits..