It generally doesn’t work like that.
Problem with a Shimano part on a Trek? Warranty part sourced through Madison
Problem with Suntour forks on a Specialised? Warranty through Greyville.
Both of the above are warranty claims I’ve personally handled
Brands don’t generally keep stock of all parts they fit to their bikes.
Well that is were the whole industy has gone wrong. I deal with such request on a very regular basis for parts on various bike we can’t have
1 because we’re an ASM business
2 because basically you should ask for the part directly from the brand
3 most of the time I have no idea of the part you need
Then the brand may or may not contact the local importer but that is a whole different story.
Then obviously you have the specific contract between two manufacturers, so depending of the brand of the bike the local importer the answer may be different ;)
To close the story short, well done on Rich.