CVPI, Town Cars and Marauder use the 'long' tailshaft housing and output shaft
In general, a retail model transmission will work in CVPI (same or compatible model year), but you will either have to swap to the steel d/s - or swap your old extended tailshaft housing and re-use your aluminum CVPI shaft. (If you do this, you also need to plug the small vent in the middle of the CVPI d/s slip yoke or you will have a tiny ATF leak when used with the short output shaft)
You can use the shorter tailshaft transmissions in a car that came with a long tailshaft. As stated, use your longer housing with it though.
But. lets also make it very clear that you cannot
use the longer tailshaft transmissions in a car that had the short tailshaft unless you replace the driveshaft to match
. It's very bad having not enough clearance in the driveline. VERY bad.