Discovery: 2005 Discovery - Belts

[SpencerA]

Edited - should be "2004" with CAT C7

Searched as I may, cannot find the 'correct' part numbers for both serpentine belt and water pump belts. :-(

Seriously, shouldn't be this hard to find the right ones...

I'm pretty sure the correct one is on the water pump as it's a 13A0865

The serpentine one is another story. With only about 18k miles on a new ac compressor, I've got a howling bearing. At ~ 72k miles the ac bearing seized and took out the belt. With all the associated damage it was a $1700 repair while on the road. So here I am again, doing a oil/filter and fuel filter change on the coach and gen and looking to find the source of the 'squealing' thinking it was a belt when I find that it's really the ac compressor when the clutch is not locked up. YAY. NOT.

So seriously wondering if the ac compressor bearing just was a crappy one and maybe the replacement compressor wasn't a higher quality one the shop used, can't find a part number on it so likely a generic rather than say a "Four Seasons". Still thought the bearing should make more than 18k miles.
Other thought is - did the repair shop use a slightly shorter belt than what was supposed to be used putting too much tension on the bearing and that caused the early failure? I was at a MACK truck repair shop not a CAT or RV shop. The serpentine belt on there now is # 01-23415-042 an Alliance part.
Short of calling REV on Monday with my VIN, I guess I'm clueless as I have searched the net for HOURS and come up with nada, nothing, a variety of belt part numbers that are all different by up to 10"...

I'm replacing both belts while I replace the ac compressor (or bearing) and really wanted to be 100% positive they were both the right ones. I have about 3 weeks before I really need to be hauling to a race so I have a couple more weekends to work on it and all the other little maintenance items.

Any help appreciated.

[Cincy Steve]

Freightliner Chassis tech support provided us w/the correct part number (& length) for both our belts - one a Freightliner part# & the other a Cummins #. Went to a local NAPA & bought cross-referenced belts BUT the length on each was a little different than the factory parts. Perhaps a little paranoid, but I returned them & ordered factory units.