I installed the A1 power window regulators and Auto-loc crank switches in my '71. They work great. It's funny, but for all the work that I put into the resto of the Blazer... they ohh and ahh under the hood... but it's the power windows and crank switches that really puts a smile on their faces.
Here's a link to the how-to:
http://67-72chevytrucks.com/vboard/s...d.php?t=153317
If you decide to go that route, this place has the best price I could find on the crank switches.... about $20 cheaper per pair than Summit.
The Car Shop