My 2001 XT600 has a long shanked bolt for mounting the lower chain roller, & a threaded pipe welded to the frame for mounting the upper chain roller.
All looks original, so I reckon the pics in the parts catalogue(same pics I have) are switched between upper & lower roller assemblies.
The lower shanked bolt(pictured as the upper bolt) screws in to the frame just above the side stand, so maybe yours has fallen out or broken off?
Bob
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Remember that Assumption is the mother of all f**k-ups.
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