Not sure why it doesn't fit. My '66 lower ball joint fit the Granada spindle. I know the Granada and Monarch spindles are the same. I thought the Versailles were the same too, but I'm not sure on that. You could call Mustang Plus and ask them as they're big on supplying parts for that conversion.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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