Or, from the designers of the Powerflex X5 bushes..........

RENTAL, BMW X5 E53 REAR SUBFRAME BUSH TOOL RENTAL | eBay

With the tool, the subframe does require lowering but not removing and all 4 bushes can be done comfortably in about 90 minutes.

Gerry.

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Black E53 V8 on 20's, lowered, drilled discs and poly bushes, strut brace and adjustable sway bars.