There is a transcription of the clarinet part of Mozart's Clarinet Quintet in A major, K.581:
the clarinet is replaced by a second viola, (and the first violin part may also be revised, not sure)
If anyone has that part transcribed for "second"-viola-in-lieu-of-clarinet", and/or the first violin part for that transcription, that would be great.
(the transcription of oboe-in-lieu-of-clarinet is already here, thanks).