If working in tight quarters combine your stubby impacts with Astro Nano sockets. I've got 'em in 1/2, here's a 3/8 set:
http://www.astrotools.com/14pc-3-8-drive-nano-impact-sockets-metric.html
Amazon is a good place to actually buy AP, and Woot has periodic sales on specific AP items
http://www.astrotools.com/14pc-3-8-drive-nano-impact-sockets-metric.html
Amazon is a good place to actually buy AP, and Woot has periodic sales on specific AP items