Yeah, I saw on the RevShift website their parts require near perfect driveline alignment, not much flex in the poly bushes.

The rubber bushes in the 2nd link allow for more flex. Downside, double the cost vs Genuine BMW part.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!