72 Dart, mini tub, narrow rear, spring relocation

im also doing the mini tub and spring relocation. i just took the 7 1/4 rear diff out of my 69 dart this afternoon so i can start on the mini tub. i have an 8 3/4 housing im going to narrow to fit what ever wheels i end up getting. for the leaf relocation are you gonna get a kit or kind of build your own? i was thinking of doing my own but i think the kit is only around $100 or so.