FYI... Did a little bit of digging around recently, and the upshot is that both diesels use an IHI turbo. It seems that the 121bhp engine uses a RHF5V and the 136bhp engine uses a RHF4V - I'm not entirely sure on those though, since according to IHI the 5 flows more air than the 4, so could be suspect. However... It's enough to know as a start. Not particularly useful, but just a point of interest.