You can order the correct support for the load floor. Support, loading floor 51717001968. I'm seeing it for ~$40.
You need to verify but I believe the rails and tension straps ( the three triangular rails the compressor mounted to) are the same.

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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold