Mitsu went to 7 bolt motors worldwide in '93. There were some oddballs in '92 and '94, but by '96 they were all 7 bolt (unless someone did an engine swap).
There is no downside to 6 bolt motor, it has stronger connecting rods and it DOES NOT CRANKWALK! The only time I saw they CW, was after unsuccessful rebuilt! Can there be an fluke? Sure, but it is extremely rare!