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Based on the TSB for squeak belts, I bought the six parts it recommends...After looking at the parts ($362 total) I noticed something didn't add up...So I did more research and discover that it's two different sides, the supercharger side and the FEAD side...A mechanic has confirmed on my car the squeal was coming from the Supercharger side tensioner. According to below, I only need four parts...Any insights? Has anyone done this before? Once I get this done, it should really go in the FAQ because the original TSB wasn't very detailed...
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REPAIR PROCEDURE

REPLACE FRONT END ACCESSORY DRIVE AND / OR SUPERCHARGER DRIVE BELT SYSTEM
NOTE:
Global Technical Reference (GTR) lookup sequence is as follows: GTR Home > NAS > Model > Service Information > Model Year > Workshop Manuals > 3: Powertrain > 303: Engine > 303-05 / 303-05A: Accessory Drive - 4.2L

1. If Normally Aspirated, refer to Workshop Manual (GTR) section 303-05 / 303-05A (12.93.06) and install a new flanged idler pulley (C2C 37064) and FEAD belt (C2C 37063).

2. If Supercharged, identify if the Front End Auxiliary Drive or Supercharger drive system is making the noise.
^ If FEAD system is noisy, refer to Workshop Manual (GTR) section 303-05 / 303-05A (12.93.06) and install a new flanged idler pulley (C2C 37064) and FEAD belt (C2C 37063).
^ If Supercharger drive system is noisy, refer to Workshop Manual (GTR) section 303-05 / 303-05A (18.91.38) and install a new grooved idler pulley (C2S 46862), tensioner (C2C 37057), pulley bracket (C2C 37056), and drive belt (C2C 37055).

 

Well,firstntry a new belt which solves the problem 85% of the cases so you only need one part

 

Hey Barcardi151, maybe my thread I made will help you out because I had the same problem....
https://www.jaguarforums.com/forum/s...ed-also-61644/

Hope it helps bro....

 

I had that done when my 2005 STR was still in warranty and posted what they changed. Since I did not do the work myself I am not sure??
On my car I was sure that the only thing touched was the SC belt and idlers?
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I already screwed up then because I bought the new updated double-ribbed belt which won't work unless you change to the grooved pulleys...On a positive note, this "revised pulley system" gives 20 extra hp according to wiki! lol

I saw yours before and didn't look at it in detail until now...Yup, both sides were done, so the original TSB does cover two separate issues...

 

Ditto to Jochem. No idler pulley swap....just a better belt, wah lah!