when swapping a 03 USDM wrx into my01 rs i have been reading that the cross member needs to be a true GC8 Xmember, USDM wagon Xmember or a legacy turbo Xmember. will the stock USDM sedan Xmember not work? what is the difference in the sedan and wagon Xmember? what gen legacy Xmember do I need? I have a complete USDM 03 wrx for a donor.