Information needed

My home is 100+ yrs old. I am trying to determine if I can purchase a toilet which would fit properly into the area of my bathroom. The toilet bolts are approximately 17 inches from center to the back wall. Does anyone know if this size is still manufactured?

I doubt it, but don't believe me! I have installed toilets that have had flanges with elongated bolt holes so that they could be moved back and forth to accomodate different mountings.

The only toilet I can remember seeing with this rough was the ones with a chrome flush ell. The tank was mounted on the wall. I'm sure with the some effort and plenty of $$ anything is available.