I looked at that site I linked before and it didn't say anything about one for a driver seat so I looked up some more things.
http://www.accessunlimited.com/html/easy-transfer.html
This shows a driver seat one
http://www.access-ind.com/equip/seat/cseat.htm
http://www.access-ind.com/
This site has some good links
http://www.familyvillage.wisc.edu/AT/Driving.htm