Anders; Not sure if this helps. From the original Ford parts listing the alternator arm is D16Y10145-A, and the alternator/compressor bracket is D16Y10313-B. With assigned Ford numbers, and being engine mounted, my thinking is application goes beyond just the Pantera (possibly Torino, Country Squire wagon). The early to mid '70's vehicles with 351C application should have similar bracketry.
The second series bracket has an arm extension to mount an idler pulley. Not sure about 1st series. Should you not want A/C, the compressor portion of the alternator/compressor bracket has an extension to mount the compressor. I suppose the compressor extension could be cut off the bracket.
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