Are you referencing the bearing on the belt tensioner? My 92/93 manual shows only a tensioner and not an seperate idler pulley. The part number for the 92/93 is 03879131.
Autozone services it as a pulley w/bearing for about $18. 00. I highly suggest buying a manual on disc from Mopar Manuals out of Scottsdale Az. Their parts manuals are great.
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86/92 Retro D-250, 5. 9 Cummins w/auto, 2wd - 256,000 / 96 Ram 1500 short bed, 318 w/auto, 4wd - 323,000 / 2000 Jeep Grand Cherokee, 4. 0 w/auto, 4wd - 251,000 Dodge/Chrysler all the way