^^^They will send you just the sites. When I wanted to have them installed on mine I wasn't sure what size I needed, so I called them up and was able to order directly from them. They have a great set that is the Sig night-sites for rear and Tru-Glow fiber-optic for the front which I have on there now. That front dot glows nice and bright day or night now. Love it.
Also, I don't have the laser on mine anymore - it was fun for mag-dumps at the range, but I couldn't find a good way to carry it with the laser attached.