looking left to right the crossmember is the very last bit of the car on the right. that is held on with 2 support/crumple brackets which are bolted onto the end of the chassis and covered by a panel called the rear valence. if the bit where you have put the red line through is what your worried about and believe to be out of line. then the chassis would need jigging to pull the corner into line. This is only guessing mind unless you can put actual pics up