I'll bet if U called them and talked on the phone, they could still hook U up, but would have to cut a bit on the slide to make their other sights work.
+1 , As Joe mentioned there is an adjustable sight shown on their web site. I'd call them and talk with the "Sight dept" guys, they are quite helpfull.
Sir:
We sometimes need to weld up a slide and then do the novak cut. Then many times we silver solder the present sight groove with a steel block and contour and then cut.
Harry B.