Not sure if I’d say „go-to“ as the extra cost is significant, but it’s definitely my favorite. A beefy lug example, ref 2577:
And they work for the Constellations all through the 50s, I believe.
2648 (steel works all the same):
2652:
2782:
2887:
2852:
14381 (same as 14393):
I don’t have a picture of the flatlink on a dogleg 14900/14902 at hand, but I think I remember that even those completely different, angled lugs work with the flatlinks and #4s.
If you collect 50s Omegas it’s incredibly versatile.
edit: I have a 2943 case at home. Can install a flatlink and take a pic, if you’re interested to see how it fits.