mine is a 98 fl Legnum. ayc diff came out of a 97 Galant, and i think it was a manual cause its smaller than my legnum diff and bolts to the drive shaft with 6 bolts and mine only needs 4.
Yes you have an evo ayc diff. 2 holes not required. Just rotate it around until 4 match up.
can't you just use the flange from your old one?