Are you talking about the pieced triangles or the solid ones? If the pieced, I would measure all, find most common size and conform all to that as discreetly as possible....if the solid fillers, make a template of the now all the same size pieced ones or measure them and away you go......I haven't gotten that far with dear jane and find some of her blocks are a definite challenge........think she did some piecing in the dark!