Guys,
Both the steel and the plastic units are available from KTM/Husaberg.
Can't remember what models have what, but a trip to the dealer will sort it out for you. From memory the older style speedo with the large plug uses the plastic unit and the new style speedo with the micro plug uses the steel unit. The only issue (as noted above) is that plug at the opposing end differs. This is easily overcome by soldering the old plug to the new loom. We sell both looms in equal quality at the shop. When i get a chance i will get both the part numbers.