From the Eaton Differential Application Guide install notes for an 8.5/8.6" C-clip axle TrueTrac (Part number 913A481):
"All Eaton differentials made for General Motors 8.5" and 8.6" axles require special bearings. For axles with small bearing bores (race O.D. or 2.89"), usually found on vehicles prior to 1999, bearing LM102949 and race LM102911 are required. For axles with large bearing bores (race O.D. of 3.06"), usually found on vehicles from 1999-2013, bearing LM603049 and race LM603012 are required. Manual locking hubs recommended for front axle applications."
This kit from Motive (Part number R10REMKT) has the correct LM102949/LM102911 bearings and races to drop an aftermarket Eaton carrier into one of the 10 bolt housings that came in these trucks.