I went thru some of this when putting a Sanden compressor on my wife's '60. Getting stuck between vendors recommendations and a motor that doesn't fit an expected standard. I can't help you with part numbers, or if original Ford parts are wanted, but I remember just walking thru a junk yard and taking a water pump pulley off something that had a wider 'bell' than mine. I think it was a Mopar. It had two sheaves so I cut one off (with a sabre saw). I aligned the belt to the compressor, measured the interior gap with clay, and cut down a fan spacer to fill it. Longer studs holds it all together. Been together 15 yrs. The fan's electric. Just sayin' you might get unstuck by getting off the parts lists and just using what works in your situation. Unless you want original.