Hi, just wondering where people tend to get the oem part numbers from, to match up buying new parts?
Ive needed a few things recently, and im struggling to find the part numbers, since different sites list different part numbers.
Is there a concise catalog anywhere that accurately lists part numbers by model?

Hi. I go to imortcarparts.co.uk they seem to have a lot of numbers listed. I also call my local Subaru garage and Gary being a helpful chap sorts me out with numbers and if they’re cheap enough the genuine parts. 

Just wondering, which parts for what model are you after? 

Hi. I go to imortcarparts.co.uk they seem to have a lot of numbers listed. I also call my local Subaru garage and Gary being a helpful chap sorts me out with numbers and if they’re cheap enough the genuine parts. 
Just wondering, which parts for what model are you after? 

Thanks, I will check it out. I'm currently looking for a precat O2 sensor for a 2006 n/a Impreza (EJ204 avcs)

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I seem to have found it.
According to importcarparts.co.uk, the oem part number is 22641AA381.
Many thanks.

A the the front one? The rear one is 22690AA810, I think anyway.. 

good luck. 

All sorted, managed to get a denso (dox-0361 is the denso part number) from opieoils for £107, much better deal.
Engine running sweet now.

Thanks