Must II suspensions need larger brakes and a lot of fab cross members do not have the serrations to hold the upper a arm cross shafts when they ar bolted down and most do not have correct spring seating shape in the upper or lower ends.. I picked up a couple of late 80.s jag sedan front susp including the factory crossmembers for 120 each. I plan to use the stock x member as a locating fixture for bolt hole locations for a arms then build the new tubing x member narrower for my rods the jag has 11 1/2 brakes and forged a arms and with new coil overs will be a lot cheaper than most other kits