Yeah I have had them on under surveillance for few days and thought about posting them here

Problem is that they are from newer engine that has balancer shafts, hence the gear in the flywheel end. And if you compare those to M42/M47 early crankshaft, you will see these two have shorter front "noses" which I think need extending which in turn means costs and also it is not-so-great for high rev reliability.
Cheap they are but not direct fit to our purposes I'm afraid
