Rod bearings, and sizes?

[jmbrodsky@domain.elided]

        Can anyone tell me what the tolerance range was for the rod 
     bearings (babbit type) as they were released from the factory.  Also, 
     if possible, what were the available bearings (-2x, -x, standard, +x, 
     +2x)?  I'm hoping I can buy just one bearing from somewhere to fix a 
     somewhat troublesome little clicking.  Not very bad yet (35K mi so 
     far) but I'd like to get it remedied.
     
        Thanks everyone,
     

     -Joel Brodsky

         '76 IHC Scout II 345/tf727 RE8000, Cibie40s, custom 
                rear tire rack, 6 different color body panels.
                Not much sport, all utility.
         '75 IHC Travelall 150 4wd 392/tf727 Hummer brush guard, 
                3/4T rear springs, Hella Rallye 2000s, Con-Ferr 5x7,
                Class IV hitches front and rear, 3" Exhaust.
                1st Place, Rocky Mountain IH Rendezvous,
                3rd Place, Tulare IH Western Regionals.
         '74 IHC Travelall 150? 2wd 392/tf727 "The 'new' one"
                Factory AM/FM, Cruise, Tilt, AC, Captains Chairs,
                Rblt, Alt, carb, fuel pump, ps pump, water pump, dash,
                seats, rear door, starter, master cyl, what could be left?