WD1770 help needed

Hello all Sadly, the WD1770 fcd IC in my home-brew fd i/o board finally gave up the ghost. Fourteen years of service is admirable -- when it finally croaked, I felt like weeping. Additionally, in violation of my policy of *always* keeping spares of discontinued components which I use -- I have no spare. Does anyone know of a source for these? Or the 1772 (I believe Tony Duell once mentioned that the 1772 could replace the 1770 in most cases -- but I could be wrong). Also, I understand that the C64 floppy drives (1581?) used the 1770 but I'm not a commie and can't immediately verify this. Anyone out there with junk C64 drives who wants to liberate this IC -- to a good home?? Any help at all on this will be greatly appreciated. Glen Goodwin 0/0