An expert friend found me the "official" place:
Rotax-Owner.com Education, Information, Support
There are three separate pdf's, one for 2-strokers, one for 912, one for 914. Current document names are listed below but are prone to change with time.
* SL-2ST-007 List of Stolen Rotax Engines REVISION 9
* SL-912-013 List of Stolen Rotax Engines REVISION 9
* SL-914-011 List of Stolen Rotax Engines REVISION 9