It seems BMW has improved the flex disc design post E53, OE are now aluminium and rubber.

https://www.ecstuning.com/ES2500955/...FVc1aQod_k4D4Q

Yeah, I will go with Cobra too. Just ripping it totally down to ensure I have a list of ALL the needed parts before ordering.

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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!