That seal removes from the back side of the flange. Remove the 5 bolts that retain the flange & the flange should come off. Then you can replace the seal in the flange. It only fits one way.
There is a thick cork gasket that goes between the flange & housing. If you can't get one RTV will work.
George

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum