I won an auction on Ebay a few days ago. The seller said these will fit a SA Mil-Spec without any cuts. The rear sight looks real close. These were listed as "Colt 1911 Low Profile 3 Dot Sights Novak Style ".
I bought the same sights as you have pictured for my Champion, the rear sight had to file a tad for it to work wich was no big deal. The front sight the tennon was too small. So it didnt work . I ended up getting this front sight from Numrich gun parts
Colt 1911 Millett Stake-On Front Sight
Includes a serrated, white dot aiming point and a .125" wide tennon. Measures .185" high. Blued-steel.