First ,sorry for the bad grammar
You have to put the exhaust away because you must remove the cardan shaft.
on picture 1-5 you see what you have to do after your exhaust is dismantled.
Then you must dismantled the Gearflange(ratchetnut 30mm for long bolts)
First you must remove the saftey plate,then the nut(30mm)and then the gearflange(remove it with an gear puller with 3 arms)
Then work saftey ! avert scratches in gearbox housing while you´re pulling the simmering out of the seat.
when you put the new Simmering in place work saftey,put the new simmering evenly in place!
Then you must mount it in the inverse order.
i hope i have not forgot anything, but the grammar
regards harald