If those are on the wall with four nuts and it's gravity with a tank, then there are many that will work for that.
My main go to right now is the Gerber Maxwell Wall Hung.
I was really glad to see this post. We have a mid century modern home from the early 50s with a 1960 Am Std Norwall wall hung toilet in Coralin. Up to three weeks ago, no problems except that you can no longer find replacement seats except in white. Then suddenly, there was a major leak. Plumber discovered the tank AND bowl are cracked and the seal between bowl and wall appears to need replaced. So, new toilet time. The bathroom is small and the tank is against the outside wall, plus walls have ceramic tile. Floor is tile over slab. SO, least expensive choice is to replace wall hung unit. The Norwalls were slightly closer to the wall than a round front tank, but I can't find round front wall hung units, only elongated. Long story short, I did the legwork and determined the Gerber Maxwell and the American Standard Glenwall are my best options. Gerber is considered a 'compact' and sits a bit closer to the wall, but I like the surface treatment of the American Standard for easier cleaning (plus, all bathroom hardware in the house is American Standard). I used painters tape and did a rough tape-out of the toilet specs and determined the American Std was not as intrusive as I had envisioned. At this point, I'll be glad for either. This forum was extremely helpful in narrowing my search!