mr_fender
Axe-Master
Graphtech makes good nuts, but precut slots will likely require additional filing. It'll be a rare coincidence if the slots are cut to the right depth for your guitar.
If the radius matches, you can sand the bottom of the nut to bring the nut slots closer to the fret board. Otherwise, yes you will need to adjust the slots to the correct radius and depth. Still much faster easier than starting with a nut blank.