eaton posi for 85' c10

I've have a 85' chevy c10 with a 355ci. and a turbo 350 tranny, both the motor and trans. have a little work done. I recently trashed my carrier in my 12 bolt 30 spline rear end that had 4.11 gears. My gears are fine and I plan on re-using them. I ordered an eaton posi for it and the company I ordered it from sent me a part no. 19556-010. I looked up that part no. on eaton's web site and couldn't find a posi for my particular year truck, but the company I ordered it from said that was the one I needed. My local auto-parts store gave me the bearings they said I needed, but those bearings were way to small. I found some bearing & race part no.'s on another web site which fit the posi great. Bearing LM-102949 and race LM-102911. This bearing and race combo fit the posi but are to small for the differential and bearing caps. I am going crazy trying to find out what bearings I need or if I have the right posi. Can someone please help?