Brake shoes help (8 3/4 BBP)

Okay:
Drums off the 8.75 are 10" inner diameter, as are the 7.25.
Shoes off the 8.75 are 1.75" and the 7.25's are 2.5"

Some FABO reading suggested that the 7.25" backing plates for SBP had only 4 bolts. My 7.25" BBP has 5 bolts.

Seems like I should just pull the axles and change the backing plates, basically using the entire 7.25" setup.