Need Help with Front Bearings

[shenk10]

I am currently redoing my front suspension and need to know which inner bearings to get. LMC Truck has two different options, one for 11" rear drums and one for 11-5/32" rear drums. My problem is I can't get to the rear to measure so I was hoping someone could help. I figured the difference in the rear drums dealt with whether you had 1" or 1.25" rotors up front, or the standard and heavy brake setup. My truck has the 1" width front rotors making it the standard or some people call it the light duty brakes. I would assume this means that I have the smaller 11" rear drums also. Just checking to make sure before I order the bearings. By the way my truck is an '82 c10. Thank you for the help.