Replacement for GU operator

Your 39-316 Truth operator shown in your video on replacing old GU operators, appears to be the one I need except for the sill mounting screw locations. Using the 39-316 operator, I would have to drill new mounting holes - I can do that if necessary. The important question is whether the operator will work properly once installed. Attached is a picture of the broken original GU operator. The dimensions are:

-length of the inner arm, from the inner bend to the riveted end = 3 3/8 inch
-overall length of the link arm = 5 3/8 inch
-between the two outer mounting holes in the sill mounting bracket = 4 ¼ inch

Of course, the shape of the 39-316 inner arm is different than on the GU operator, but I suspect that the overall arm length in the closed position is probably the same.