Not sure what your problem is 5mm is close tolerance in Land Rover chassis measurements
Pull in or spread chassis rails to suit rear crossmember so it all lines up, more critical is hight of top of x member as chassis curves down at the back.
did this repair not long ago and from memory top of member was 35mm below level top section of chassis but don't rely on me just yet as it is late at night
l can measure tommorow on an unmolested chassis if you want.
Good luck with it and don't worry about neat welds or someone will twig it's a repair
Cheers Paul
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