on this site the guy talks aobut this set up
"Specificaly, it will bolt right into your 901 transmission. However, you will need some longer studs on the engine case in order for them to extend far enough into the Porsche tranny's bell housing so you can thread the nuts on. All you need to do is use your Superbeetle 12v flywheel but use a Porsche style diaphram assembly with the clutch. A Heavy Duty 200 mm friction disk is what I used with the Porsche Style diaphram assembly. Now the only thing you need to consider is that the Porsche Starter will only engage into the Superbeetle Flywheel teeth approximately one third of the way since the VW flywheel does not stick out as far as the Porsche 912 Flywheel. Many say that this will wear out your Flywheel's starter teeth prematurely and others told me that they used it like that without problems. My soloution was to remove the starter motor and then remove the rear aluminium housing off the starter that includes the starters mounting flange. I simply mounted and machined the housing on a lathe in order to remove about .100 inch off the flange surface"
http://www.geocities.com/clarkblumbe...-912page9.html