The passenger side axle shaft has an intermediate shaft, which is supported from the rear motor mount bracket by a bearing and bracket assembly. It's an E7xxxx p/n which I would imagine was used on maybe the MT-5 or maybe an ****** or a tempo with an MTX-III or something.
If you were getting a custom shaft made anyway, I'm sure they could fit the shaft up with a bearing (or vice versa) and built a hanger bracket like the OEM piece.
Re "special to Taurus SHO" bearings, you'd be suprised. There are a few unique Ford only bearings in the MTX-IV tranny, not available from any aftermarket bearing supplier. As far as I know, these are obsolete: output shaft rear bearing, input shaft front bearing shim, input shaft front bearing. The others are still available through Timken, etc. (diff bearings, output shaft front, 5th gear shaft, etc) Just match up the LM #.