Thank you everybody for responding.
Status update: Loewen’s doesn’t have the part. I sent pictures of the cracked spinner to AeroSupport, inquiring about whether it’s repairable, but they haven’t gotten back to me. We found a spinner from a 1977 M20J 201 (our’s is a 1985), which fits perfectly except the holes along the U-shaped prop blade cutouts do not line up. So, I guess we’re still looking for the perfect replacement. The prop is the standard McCauley for that year (#82D34Cbl4/PODHB-16E or -16EP*). If anybody has a potential replacement and has pix, I can tell by sight whether those cutout holes would line up or not.
KS Mooniac - I would think we’d be happy to sell our cracked spinner.
Alan Fox - I’m not certain what fair price is for these, but any reasonable price would be fine.