Yea, seat parts are NOT usually in the parts system, in fact ordering an entire seat is extriodinarly expensive, because it is never done; so yea, the dealer is NOT going to be any real help.
Concur with Concours14, you need to go to junkyards and find the bar off an existing seat. Its hard to tell from your photos, there should be interlocking teeth in the rails that the bar/lever disengages to allow it to move. It appears you're just missing the bar, but you might be missing other parts as well.
Like said already, the Commander (XK) is based on the WK generation of the Grand Cherokee, having lots of parts in common, so a bar or seat rails from one of those vehicles is likely to work as well as from a Commander. If you only need the bar, I wouldn't be surprised if a bar off other Chrysler/Jeep/Dodge Vehicles would work as well.
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