I did find the link and the number of those who signed that letter at
this point is 484 and about 47 of them appeared to have Muslim names.
The reason why I went looking for the letter was because I was very
sure that the number of Jews signing that letter would be zero and I
was almost correct – there was only one Jew who signed that letter
(Norma Cohen (Actor and Writer). As I have said again and again and
again, the Jews are very much interested in remaining in Palestine and
therefore they would not be doing anything to undermine that desire of
theirs.
https://docs.google.Com/document/d/1QOL9_mCeVB2-iMEGBBtVfc4bCKYhOM8UaKDIYyulULo/edit