Thanks allthumbs, but I have the piano score for the "regular" op 58.
There's a version for piano, 2 violins, 2 violas and 1 cello which is virtually never heard (there is a CD of it, I think it's either Levin or Goode, I'm forgetting). It was arranged by a contemporary of Beethoven, and the Master himself did some twiddling with the piano part.
I would like to get the scores for all parts--but I have no idea where to find it. Maybe I need to call around. thanks!
Teresa