AE86 Driveshaft too long? [SOLVED]

[MyCrazyGarage]

Hi,
i am currently replacing my completely broken Center Support Bearing and i found a problem.

My 86 apparently was a SR5 with an 4AC Engine and Open Diff.
When i got it, it had a 4AG and an T50 Gearbox and what i think is a T Series LSD. (It says "LSD OIL ONLY" on it and has 10 carrier to axle housing bolts)

It seems that my old Center Support Bearing broke because the rear Driveshaft is too long, the new one doesent even fit the bolt holes because it needs to be moved 1-2cm to the rear.
Also the Driveshaft is completely bottoming out into the Gearbox.

I´ve done my research and know that there are 740mm and 760mm rear Driveshafts.
BUT i already have a 740 mm rear driveshaft.
I am completely stuck and have no idea what to do now.

Can provide pictures for clarity