Here's a guy who put a 901 into a bug.
http://www.aircooled.net/gnrlsite/resource/articles/porsche5spdconv.htm
He used a 901 from a 911 (so no mounting "ears" on the trans like on the 914).
Just FYI, on either the 901 from the 911 or the 914, you can rotate the differential for mid versus rear engine applications.
angela