Mansfied Toilet Compatibale bowls?
I will answer by using this question as a platform to address the difficulty and expense, at least in the U.S.A., of procuring one replacement piece (tank or bowl) for a 2-piece toilet.

There are numerous manufacturers of toilets from many countries and locales, most offering (at least) several designs and several colors of each design.

The primary reason is financial. Supply and demand dictates that sales of complete toilets would dwarf sales of just a tank or bowl. With essentially zero demand there would simply be no financial incentive to ship, wholesale, then retail the individual components for separate sale. If they did, the cost would likely be very near the cost of buying a complete toilet, which would undoubtedly rankle most consumers. 

That being said, there are exceptions. A good plumbing shop may very well have just a tank or bowl available for the basic top seller at their shop and in the most common color (white). You also may be able to order a replacement from the manufacturer, through a distributer. What you are not likely to find is replacements for anything no longer manufactured (designs change frequently, for many reasons); anything in a color that is not white; anything not originally sold in large quantities; anything from a distant land.