Tradition made a 54mm figure of Tilly, as part of a set depicting the Meistertrunk von Rothenburg, the incident from the Thirty Years' War in which the Mayor of Rothenburg saved the town council from execution by downing a measure of anywhere from 3.25 to 6.5 L of wine in one draught. I don't know off the top of my head of figures of Wallenstein or Gustavus Adolphus, though it's possible that any of the German makers, such as Peipp, may have. Peipp does have an extensive catalog of Thirty Years' War figures. They're listed as 54mm, but they're a little larger, around 58mm to 60mm.
New Hope Design might have figures of them, too, in their Men At Arms series, but I don't know for sure.
Hope that helps to give you a start, prosit!
Brad