Chain Guides 04' N62 4.4

[Bulk]

I can see 6 from RealOEM but I've been told that there are 7. Three things

1. Where is this 7th guide rail
2. Is there anything else I should replace while I'm in there
3. Where would you recommend I purchase these from


Here are the part numbers I have

Guide Rail (Cyl 1-4) - 11317533479
Chain Tensioner Rail (Cyl 1-4) - 11317504440
Slide Rail (Cyl 1-4) - 11317504471
Guide Rail (Cyl 5-8) - 11317504461
Chain Tensioner Rail (Cyl 5-8) - 11317533489
Slide Rail (Cyl 5-8) - 11317504475

Timing Chain Cylinders 1-4

Timing Chain Cylinders 5-8

[SlickGT1]

Isn't there a U-rail as well, down in the V?

Did yours go, or are you just planning/maintaining? You need quite a few specialty tools.

[Bulk]

I'm starting to get the diesel engine noise which could just be an oil pressure issue but I am thinking it'll need to be done soon anyway - It has 170K (km's) on it