Rear axle/brake Q's?

The drums are dual drilled but the axles are not. The axles look factory BBP, there is only one set of stud holes. Must have modified some longer axle shafts. I will try to remember to take pictures tonight.

The drums have flares.

This is why I am so confused about what is happening on this thing. 10x1.75" SBP brakes ( I measured this am) , LBP axle to factory length 27 11/16". Yet everyone says you need 2.5" wide brakes for the LBP axle swap.