Here are the single pole 25 Amp breakers that fit in this box, for each of these there is an equivalent double pole one that also fits:
7405 Flat Rocker A-Frame
7544 Flat Rocker C-Frame
7218 Toggle A-Frame
All are good for 240 Volts. The C-Frame has more robust terminals which are good if your wire is stiff or large. The toggle breaker is available in a variety of toggle colors.