The best donor car is the XX4, what edition depends on what spec X5 you want, but I would say go for a XX4WE.
As far as I am aware every spare is still available that you will need.
Yup it is 4+2 cells.
I would get the shock tower strengtheners, a one-way (personal preference) and upgrade the standard xx4 front drive shafts to CVD's.
Hope this helps
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Yokomo - LMR
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