After this happened to me twice, I've taken care of this situation and get me a second quick release plate.
In use is with me the tripod 'Manfrotto 785B' and I once had to search until I had found the right plate for my tripod.
According to the description, the release plate fits the following Manfrotto models: MA 785B - MA 785SHB - MA 715B - MA 715SHB - MA 718B - MA 718SHB - MA 725B - 728B MA. Whether it is appropriate for all listed models wirlich of course I can not assure binding. At least with my 785B fit.
And now the dark forest may ;-)