Can't Find Any Ignition Reluctors Anywhere

I recently found that the reluctor inside my distributor had gotten rusty somehow. But no one had any repalcements for sale. I had to go to eBay to finally find one. Any one know of any part numbers for the reluctor? I've only found these three online:

Borg Warner RE15
Standard Motor Products LX-227
Wells F135

The Standard LX-227 is no longer listed in their online catalog, so it's likely discontinued. Anyone know of the Motorcraft part number? Or any others for sale?

Thanks.