Try 42 by 48 or 32 by 58, the sum of the interior angles should equal 90. An important concern can be left or right handedness in the braces. I tend not to think of brace angles rather in slope. If I frame a roof at a 10/12 slope, I might choose to frame the braces at 12/10. Very effective plate to sill bracing often needs a slope much greater than the common 45 degree brace.
So sorry, I miss read your dimensions as degrees, I must clean my glasses