first is the ratchet broken or did it just slip something and not ratchet any more ?
Ive seen the metal spread on this type of hand break and allow the geared piece to not catch but slip instead. might be fixable.
But other than that you are left with the stealershp and fleabay.
Not sure where you're located but you might check rockauto.com sometimes they carry odd parts for cars, worth a look.
Good Hunting!