I just placed a massive parts order from FCP Euro for all of the chain guide-related parts. It was quite the list, especially since I'm doing the valley pan as well. The total ended up being around $650 with shipping, thanks to some aggressive price-matching.

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6