8.75 Spring perch Relocation Measurements

ok dr diff only sells the 1/2 offset shackle spring kit. i was thinking you were mini tubbing your car. i think standard perch width is 43” so wouldn’t you just move the perches in 1/2” per side to a 42” perch width? i would install the shackle kit, install leaf springs and then measure the width of the leaf spring dowel pins to be sure.