You dont really need to narrow the housing... unless you want to change the offset of the wheel to give it more dish. Its more bling than anything else... but it would be a good idea to have the wheel center in the center of the hoops in consideration for strength.
So with that said... you wont need to cut your perches off, unless they hinder your tire and wheel fitment or if it hinders your leaf spring re-location and off-set shackle/leaf spring clearance with the whatever wheel and tire you choose to run.
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