"Bremmar sleeve"?

I was doing some YouTube mining in regards to our GRM Daytona Prototype thread and found a reference to a guy who had converted a WRX drivetrain for use in a 914.  He references a "Bremmar sleeve" in that description but offers no information on it.   Any ideas?

It blocks off the rear output of the transaxle. Dune buggy guys started it  

http://www.bremarauto.com/products/subaru-2wd-conversion-kit/

T.J. said:

It blocks off the rear output of the transaxle. Dune buggy guys started it  

http://www.bremarauto.com/products/subaru-2wd-conversion-kit/

Thanks for the lead.   They're in Australia, naturally.... :(  

In reply to stroker :

I think I remember seeing a few years back where one of the Porsche speedster replica builders was using them in the U.S. 

Edit: Check out Beck. Also the Factory Five 818 that GRM built. 

Someone makes it over here too, and Bremmar started it long before the Dune Buggy guys did it.