I've had these on my full size SR1911 for a year. Like them a lot, both full light and low light/no light backlit drills. Easy install with site pusher. Planing to also add them to my new carry piece XDs. I remember looking at Dawson's who also had SR1911 nite sites. Might want to check there as well.
http://www.heinie.com/shop/3007p-ruger-1911-slntpro-straight-eight-night-sight-set/