THAT IS CORRECT , THOSE SHIMS ARE USED TO SET THE PRELOAD ON THE REAR AXLE BEARINGS ONLY ON THE 10 BOLT , THEY ARE A TAPERED ROLLER BRNG INSTEAD OF A SEALED BALL BEARING LIKE ON THE 12 BOLT,ODDLY ENOUGH THE SHOP MANUAL FOR THE 10 BOLT CALLS FOR THE BEARING TO BE PACKED JUST LIKE A FRONT WHEEL BEARING , ALTHOUGH I DON,T HTINK IT EVER GETS DONE , AS YOU WOULD HAVE TO DISSASSEMBLE THE AXLE ASSY TO GET THE BEARING OUT SO YOU COULD PACK IT AND IN THE PROCESS PROB, DESTROY THE BRNG JERRY