I remember reading an ad from a company that did comversions such as this...they called it "VolksAir".

Found a neat website made by a guy who did the conversion...

http://mywebpage.netscape.com/AlphahR/volksair.htm

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car