Boondoc when I replaced the gasket on mine I got some excellent advice here from Brian Carlton. Get a 6mm hex key and cut the ends off. Use a 1/4'' or 6mm ratchet/ box wrench with these parts to remove the hex bolts. I also found that I could use my 6mm hex socket with the wrenchs to turn the bolts. It was a pita but the leak I had on that side is gone. So it is worth the effort. Use some good gasket sealer too.
Good luck
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If it ain't broke take it apart and find out why.
1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King
Ride in Peace Eric Peterson, Harley of Macon