i have made them for anything using a v8 gearbox bellhousing (v8, tdi disci/range etc) because the plate needs only to be 10mm thick, and a spigot bush adapter for the end of the crank.
havnt attempted to make one for a defender because looking at the bought conversion plate they are a lot wider than the other type. there didnt seem to be an easy way of making it, may have a go one day though.
put one in a 300 disco using the standard box with an lt77 v8 bellhousing the 10mm plate drilled to fit and a spigot adapter about 2" long. been in there 2 1/2 years and gets used and abused on a farm every day.