Here is the plan to modify the sub-frame and bolt to make it work:

As a side note, the stock bushing length is about 69mm for the dowel. The K-MAC supplied one is 68mm. There is a significant gap for the bushing to sit in the housing--which is why it's crucial to torque the fasteners to the limit in order to compress the coupling to reach the knurlings in order to remain stationary.

One thing I wish came with the kit was class 10.9 fasteners instead of an 8.8 since the max torque for an m12 bolt is 100 Nm, or roughly 75 ft*lbs. The OE used class 10.9 fasteners on nearly everything suspension related.

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6