I didn't want to clog up the other threads so let's put this one here although it is not exactly the topic for which the thread was created and intended for. Knowing that your Google-Foo is pretty strong and apparently you've already been racking your brains at this one task, so I wanted to ask you what walls you've been hitting? (un)availability? inexact fit? too expensive? rebuilds? all of these mentioned? There are sites which car dealers look up which may not be that well known to the general public but I wanted to get an idea as too your own search criteria before I start spewing info which you may already have researched and exhausted. Not going to pry you away from your prized K18/BD combo, well because, my name is not Marc! Trying to help you to find you this part if I can through some other sources.
ETA: often when it comes to searching for parts, a VIN will help out more than anything else really but that is some info which you may not wish to share, specially on a public forum! Additionally, need to know if it's all factory WRT your 1996 Ford F450 Superduty or is it hybridized and pieced together in any way? I reckon that it's your flatbed truck, right?