http://www.classicperform.com/Store/Power_Windows.htm
http://www.classicperform.com/Store/Power_Windows/PowerWindowConversion.htm

They are a bit on the expensive side, but they are what I plan to be using for the fact of easier installation. These are made to bolt right in the stock location. I was also looking at a few flat glass power window kits on ebay before I decided on these.