If guess if it were my tk, considering the cost of a new rack, I would remove the rack, press out the bushing/s, then measure them up and look for universal replacement bushings (if '14's or other year Rams's didn't fit). Chances are high the engineers used an off-the-shelf size as it would be cheaper and faster than having a vendor create a brand new dimension bushing. It's possible it is a one-off, but generally car companies like to standardize on common items such as bushings so they can buy in bulk and save $.
There are scores of bushings out there like on Summitracing.com, and other places that provide dimensions. One ought to be able to match something up, I would think. If the only size (diam) was too long, you could cut it shorter, for example. In the odd chance you can't find the right diameter, you could create a sheet metal sleeve to build the gap, or pin a pretty-snug bushing in place. If you or a buddy have a mini-lathe, you could remove a little material off one that was a scootch to large. So you have options. I would be very surprised if you couldn't find a bushing that would work.
If needed, you might need to measure the bore and the bushing then reinstall the bushing and rack if you need to drive the tk while you are searching/waiting for the new bushing unit to arrive.
Did you look on Youtube to see if anyone has a proposed solution?