Gearbox oil leak

Hi there.
I have an Audi 80 cabrio 2,3 build jul. 1991.
It has a manual 5 transmission.
Oil is now leaking from where the gear selctor shaft is comming through the
Question: Is it possible to change the oil seal from the outside without the need to disassemble the gearbox?
Any help is warmly welcomed!
Thanks in advance
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