The Powerflex bushings have held up great, just be sure to grease the sleeve well during assembly.

ECS Tuning had the best price when I picked them up last year (got the FULL set, subframes, sways & CABs).

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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!