Hi Grumpy. Once again I have to agree with you, the only problem is that the clutch is cast so would be rather expensive to replicate! I have asked Greenfield if they have any parts for the HD8 in stock and am waiting to hear back from them as, ideally, i'd like to replace the clutch, rear axle and 1 rear wheel!
Working on the clutch has also proved to me that the engine is definitely replacement. the crankshaft is higher than the original engine (Honda G65) and the clutch operating arm has been modified to suit. All I have to do now is find Honda G65 for it!
This restoration looks like it's going to be a bit more expensive than I originally thought and it's a shame that I wasn't living in Aus as I would have been able to get one of those HD8s on eBay that I posted few days ago which would have worked out a lot cheaper! Oh well, the joys of restoration.