Rear brake lines on an 8 3/4 question...

I also realized I dont have spring perches on the 8 3/4...
(2) LEAF SPRING PERCHES 3" WELD ON REAR END AXEL HOUSING PAD 1000117 | eBay will these fit the bill?

I feel kinda dumb for asking, but are they necessary? Or are they only needed to relocate the leaf springs?

Thanks guys